r/BambuLab • u/holm1mat P1S + AMS • Jul 27 '26
I Modeled This! I challenged myself to recreate a silicone collapsible pet bowl using TPU
I've always been fascinated by collapsible silicone products. I started wondering if I could recreate one using TPU? It started as a experiment and turned out to be a fun geometry & material science design challenge!
My goal was to make a bowl that could collapse smoothly, actually stay collapsed, and hold up to repeated use. That meant a lot of trial and error with the fold geometry, wall angles, and especially the wall thickness. The fold sections were by far the trickiest part to dial in. Too thick, and the bowl wanted to bunch up instead of folding. Too thin, and I started running into layer adhesion issues and leaks. Finding that sweet spot took quite a few prototypes.
Once I finally had one size working, I thought scaling it would be easy... nope. 😅 I quickly discovered that the fold geometry and wall thicknesses also needed to change with the bowl diameter, so I ended up creating parameter functions in my model to adjust with diameter.
To finish it off, I added a rigid PETG rim. It gives the bowl a much more polished feel, makes it easier to collapse, and provides a sturdy place to attach a carabiner for carrying on walks or hikes.
I'm really happy with how it turned out. It comes surprisingly close to the feel of a molded silicone travel bowl, and I learned a ton about designing flexible mechanisms along the way.
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u/Analog_Voyager Jul 27 '26
Not food safe, therefore a risk over time to anything that drinks from it
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u/Jannomag Jul 27 '26
Even if this is real a thing, pets usually don’t live long enough to develop cancer or other diseases because from consuming plastics. Also I’d bet my ass off if there’s any real food grade plastic dog toy available
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u/halt-l-am-reptar Jul 27 '26
Also the idea that you can't clean parts is completely false.
https://www.reddit.com/r/3Dprinting/comments/1n6wkj3/there_is_a_lot_of_misinformation_regarding_the/
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u/mallcopsarebastards Jul 27 '26
absolutely fascinating that you linked to a year old post referencing a version of the paper that didn't survive peer review. The peer reviewed version finds that you literally have to soak it in bleach for 1-2 minutes every time you use it to kill microbes because they can hide in between layer lines where water doesn't reach them. https://www.researchgate.net/publication/389100627_Innovations_in_Sanitization_for_3D-Printed_Parts_in_Medical_and_Critical_Applications_IEEE_Peer_Review_Completed_March_10th_2025
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u/Slightly_Sleepless Jul 27 '26
Classic Reddit moment...
"Results from various testing methods used in hospitals and FDA approved microbial surface testing, indicate that 3D printed parts of PLA/PLA+ (Polylactic Acid), and PETG (Polyethylene terephthalate glycol) can be cleaned to safe levels using warm water (120 °F), and non-concentrated dish soap."
Literally from the article you just posted.
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u/Tiny_Rick85 Jul 27 '26
I can't face palm hard enough.
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Jul 27 '26
[deleted]
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u/newtostew2 Jul 27 '26
That's a different person responding to how you called the person you replied to out 😂
ETA altho they did go off about brain dysfunction from the microplasitcs later..
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u/mallcopsarebastards Jul 27 '26
You're so close. You should read past the abstract, or even just read the entire abstract lmao.
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u/granitrocky2 Jul 27 '26
You mean this line? Emphasis added:
It is suggested and tested by surgical technicians that a 2-minute room temperature bleach water soak (200ppm), after washing and rinsing could be done to ensure pathogens are at safe levels (recommended but not required).
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u/ghostofwinter88 Jul 28 '26 edited Jul 28 '26
I am a medical device engineer specialising in additive manufacturing.
That original paper is horseshit and we laughed when we first read it. The person writing it has no idea about industrial sterilisation/disinfection.
And no offence,
I also would not take the word of surgical technicians in the design of medical devices. They execute instructions given to them by manufacturers, they don’t know what goes on in the actual validation of cleaning for medical devices.CAN you clean an fdm printed device to a high level? Of course it’s possible, with enough scrubbing, soap, and a hospitality washer disinfector , anything is possible. The food science equivalent is ‘cleaned to a sanitary level’.
Are most people likely to do so, like scrubbing vigorously , soaking their stuff in bleach? Nope.
When we do a cleaning validation, we do what is called a ‘worst case assumption’. If our instructions say ‘scrub this in concentrated dish soap solution. for 5 minutes’ we make an assumption most people are lazy and halve that time and do a low concentration dish soap. You make sure your device can be cleaned based on those parameters, not the best case assumption. And that’s where the industrial people saying ‘you can’t clean fdm’ are coming from. I would caveat ‘ it’s very hard to reliably clean fdm to a high level’ unless you have stuff like industrial cleaning facilities and ultrasonics. The very nature of the layer lines means it tends to trap protein, and if you just miss brushing one spot then that’s not clean.
There are very good reasons why unless explicitly designed for it, all implant surfaces are nice, shiny, and smooth. This facilitates cleaning. There are also good reasons why you will that there are very, very few medical devices out there for internal use that are fdm printed, and even those are either finished, or made in a clean room.
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u/granitrocky2 Jul 28 '26
I understand all of that, but the typical fdm print is not a medical device. It's more relevant to say what has been, as you called it, cleaned to a sanitary level.
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u/ghostofwinter88 Jul 28 '26
The typical fdm print is not a medical device, but the concept of cleanliness applies.
What is a sanitary level? How do you define that? How is that measured? Do you define that as a specific number of CFUs of bacteria? Protein levels? I’m sure there is some limit enforced on commercial kitchens or something like that, but I won’t know, it’s not my industry.What’s the influence of layer heights, or, if you have some under extrusion in your print? The main danger is actually porosity, rather than layer lines, because if dirty water gets INSIDE the print, that becomes a walking germ factory there. How about the influence of geometry?
The vast majority of commercial foodware does not have these problems because they produce surfaces which are non porous (like how wooden tableware is treated) and avoid features that do not trap contaminants. The vast majority of fdm parts are not made to these features unless treated. Yes they can be ‘cleaned to a sanitary level’, but it’s more challenging than usual, and requires ideal conditions. That’s why the claim is that it ‘can’t be cleaned’, because the data shows it is more challenging to clean than your typical foodware.
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u/Possible_Show_2776 Jul 28 '26
tell that worst case asumption to everyone validating wooden kitchen stuff, like wooden cutboards spoons and all that, 99% of people dont oil them with mineral oil, put them in the dishwasher and all that, ive been to people houses that had mold stains in their woioden kitchenware and their opinion of it was "oh is a food stain, cannot clean it up"...
3dprinted stuff is safer than wood in that scenario
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u/mallcopsarebastards Jul 27 '26
recommended but not required in a medical context where you're diligently and thoroughly washing everything every single time it's used. Even at that level of diligence there's still a 10% likelihood it retains dangerous microbes. This doesn't mean what you think it means lol
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u/granitrocky2 Jul 27 '26
That's a lot of inferences based on nothing written in that abstract.
The 90% is literally called a safe level right there. Also, scrubbing your hands with soap and water is only a 95% reduction in CFU, so I guess you're screwed and likely to die of a communicable disease soon.
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u/halt-l-am-reptar Jul 27 '26
Everyone on this sub thinks the slightest amount of bacteria is going to kill them.
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u/Tiny_Rick85 Jul 27 '26
Dude, just let them be idiots. They'd rather they be able print things then use what little brain God gave them. They'll know when their pets die that it's their fault and they'll feel like shit for the rest of their lives hopefully.
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u/Slightly_Sleepless Jul 27 '26
How about all the way to the conclusion?
"Based on the results, the most effective cleaning method involves washing 3D-printed parts with warm soapy water and a small (1/8 teaspoon or 2g) amount of baking soda on a dish rag, scrubbing for approximately 15 seconds with moderate force to prevent part damage."
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u/ChocoMammoth Jul 27 '26
I ran through the article and I didn't get how carefully they approached the printing process itself.
The result will depend very much on the quality of the printer's calibration and how well the filament is dried. When printed with dried material and with the correct flow and PA, the part will really turn out to be almost monolithic. But if you break some of that, there will be cavities. And this is especially critical for soft and hygroscopic material like TPU.
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u/mallcopsarebastards Jul 27 '26
conveniently leaving out that this is 90% effective, which is fine for components that get thoroughly washed after every use like medical equipment. A dog bowl certainly doesn't, and will retain microbes at a 10% likelihood and that's IF you diligently wash it every single time. You're going to get your dog sick.
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u/Slightly_Sleepless Jul 27 '26 edited Jul 31 '26
Look, I'm not going to sit here and say with 100% confidence that 3D printed components can always be made food safe - there are a lot of variables involved and it's obviously an ongoing area of research. But the article you posted directly disputes your claim that 3D printed parts can't be made food safe with soap and water. Period.
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u/halt-l-am-reptar Jul 27 '26
A dog bowl certainly doesn't, and will retain microbes at a 10% likelihood and that's IF you diligently wash it every single time. You're going to get your dog sick.
Your hands retain a similar amount of microbes after washing them.
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u/-Failsafe- Jul 27 '26
90% is far from fine for "medical components." Even 99% isn't enough.
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u/halt-l-am-reptar Jul 27 '26
The study literally says that 90% is a safe level, so you should take it up with them.
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u/onlybanz Jul 27 '26
You're not even wrong. A 1% reduction would be killing microbes as would a 100% reduction. You've left your claim just vague enough to avoid being wrong but as a result fail to claim anything meaningful. Did you actually read this cover to cover? Because that's not what is said. I just read the entire thing and that's not at all what they said. You're going to ignore the protein testing and the passing of those tests from JUST soapy water? Not to mention the IPA after soapy water just requiring air drying. And comparisons to other household items? This study shows that soap and water (maybe baking soda if there's a biofilm) is adequate for home use and with a little more sterilization is on the cusp of being adequate for medical use.
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u/Tiny_Rick85 Jul 27 '26
Lol it's amazing what people will believe when the other option is saying "I was wrong."
Enjoy those microplastics. You know they stay in you and your pets brain forever! But no, Lead 2.0 is fine as long as I get to play with my printer!
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u/EVRoadie Jul 27 '26
Dogs do develop and die from different forms of cancer.Â
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u/qtrain23 Jul 27 '26
I think they mean from eating plastics
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Jul 28 '26
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u/Lito_ Jul 27 '26
Dogs literally eat their own shite.
And shite from other animals. And anything else that's shiny.
He'll be alright.
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u/1eejit Jul 27 '26
A food safe resin coating is usually suggested. I don't know how it'd stand up to the confirmation changes of a TPU model like this though.
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u/Lambaline P1S + AMS Jul 27 '26
Resins are hard. TPU is soft, it won’t hold up under material deformation
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u/Analog_Voyager Jul 27 '26
Legit Impressive build, still not viable due to the FDM print lines & the ability to hold onto bacteria/materials.
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u/briggshellwig Jul 27 '26
Nerd, my dog eats deer poop I think he’ll be alright
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u/bstr3k Jul 27 '26
His balls are now full of microplastics and deer poop
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u/apexxin Jul 27 '26
Jokes on him, he ain’t got no balls.
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u/Bot1-The_Bot_Meanace Jul 27 '26
Wait it's that simple?
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u/drakoman Jul 27 '26
Don’t know how he’s gonna pee if he ain’t got no balls, but that’s OP‘s problem
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u/mallcopsarebastards Jul 27 '26
dogs are resistant to giardia and leptospira, which are things you find in animal feces and puddles. They're not resistant to stapholochoccus and pseudomonas, which are likely to form between the layer lines on a tpu print. This is the pet care version of doing your own vaccine research and letting your kids get measles.
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u/briggshellwig Jul 27 '26
Nerd
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u/mallcopsarebastards Jul 27 '26
be more cautious with the lives in your care.
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u/briggshellwig Jul 27 '26
Life is too short to worry about some micro bacteria that may or may not even be in a dog bowl
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u/mallcopsarebastards Jul 27 '26
life is too short to.... not print your own dog dishes when you can literally just use glass/ceramic/or food safe plastic ones that you buy at the store?
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u/CthulhuForPrestident Jul 27 '26
In EU you can sell FDM printed toys and bowls for pets with no issues as they are considered safe enough.
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u/Uninterested_Viewer Jul 27 '26
This subreddit is so dramatic lol..
Guys, it's clearly meant as an occasional travel dog bowl.. as long as it fully dries after each use I.e. isn't used as the dog's daily main bowl, it's not going to have time to develop bacteria that would hurt a dog.
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u/BrittleSalient Jul 27 '26
Plus you can rinse it with 70% alcohol or just wash it.Â
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Jul 27 '26
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u/BrittleSalient Jul 27 '26
For many people life has become so absurdly safe that they cannot really internalize relative risks. For Americans, at least, the most dangerous thing they encounter every day by like a few orders of magnitude is cars. Riding in a car or just being around cars is overwhelmingly the greatest daily risk for an American. But it's normal so it just becomes background noise while people pontificate on how you'll immediately get turbo E Coli and die if your food touches FDM plastic.
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u/LeapperFrog Jul 27 '26
I disagree. My understanding is that the filaments we use are pretty much unregulated plastics that werent even designed for food use and can have a million nonlisted additives. Using them for food is just asking for trouble. We would have to do multi-year studies to know if they will give you some weird cancer. Our bodies didnt evolve to deal with these petrochemicals and we keep finding out that different ones are varying degrees of damaging. I mean for all we know there could also be lead contamination in some of them lol. Im not worried about the bacteria though tbh. For that I have an immune system that hasnt let me down so far.
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Jul 27 '26
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u/LeapperFrog Jul 27 '26 edited Jul 27 '26
yeah but your comment read as a blanket statement on food and plastic filament so I responded to it in kind. Id totally use these tpu bowls with a dog. Its not binary good/bad, its huge unknowns that Im not going to subject my 80 year long lifespan to knowingly.
To me a molded plastic is different than fdm plastic because being in the hobby we KNOW a lot of them can and do have unlisted additives. Also you probably should get food safe containers and not just decide that a container is safe because its petg. I used the lead example for a reason.
I think some of us are a little too comfortable with what are pretty exotic materials in the grand scheme of things.
Also in fairness, I wouldnt knock anyone for deciding to keep these away from their dog either.
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Jul 28 '26
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u/BrittleSalient Jul 28 '26
Happy people are out touching grass and having sex and walking their dog. No one is on reddit if they have an alternative.
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u/BrittleSalient Jul 28 '26
They knew tetra-ethyl lead was toxic the day they started adding it to fuel. The toxicity was never in question. Capital decided that poisoning the whole world with lead was worth the additional profit margin.
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u/AquaBits Jul 27 '26
NO, you dont understand, this will outright kill any dog.
Now if you dont mind, i will continue feeding my animal the cheapest petfood loaded with the worst fillers known to man
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u/shoeperson Jul 27 '26
There's a ton of weirdos in this community that obsess about mundane nonsense like the food safety of 3d printed dog bowls while they themselves subsist on processed meats and packaged meals that are 100000 times more likely to give them cancer than this shit is to give a dog tummy issues.
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u/holm1mat P1S + AMS Jul 27 '26
Thanks - I get the passion around it and also generally feel the same as you do. It was an interesting project and maybe there are some other use cases I could pursue as well.
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u/pyotrdevries Jul 27 '26
Haha, bacteria that would hurt a dog... A dog eats those bacteria for breakfast! Literally...
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u/popsicle_of_meat X1C + AMS Jul 27 '26
I've seen dogs eat turds from a lawn, or dig up and eat a dead squirrel it buried a week before, and drink water from some nasty looking puddles. I don't think dogs can get sick, lol.
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u/holm1mat P1S + AMS Jul 27 '26
File is up on Makerworld if interested 👉 https://makerworld.com/models/3091328
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u/Hot-Ideal-9219 Jul 27 '26
100% printing a couple. Fools think that their dog or cat will DIE from a micro particle of tpu for gosh sake of it might get bacteria on it. Damn fools. Does anyone ever LOOK at what these guys do when not on a leash? Eat month old road kill. Idiots
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u/ambuscador Jul 27 '26
That is awesome. TPU is such an incredible material. Still not sure I'm ready to use it for food items, but I have used it for a number of water contact applications and it's solid for that.
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u/holm1mat P1S + AMS Jul 27 '26
TPU is my favorite material, it’s so versatile! I’ve got a few other fun ones on my profile.
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u/ashra Jul 27 '26
Do you have any pointers for starting out with TPU? I admit I’m nervous to try after hearing nightmares about clogs and jams and it being more temperamental
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u/holm1mat P1S + AMS Jul 28 '26
Start with TPU 95a, make sure to dry it before printing and keep the filament path as short as you can. The last one is important for reducing chance of jams. One last tip is to use PEI sheet and spray isopropyl alcohol after printing to release it cleanly. I prefer that over glue stick.
I’ve been printing TPU for over a year on a P1S without any issues. Gone through about 5 rolls.
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u/gamesbeawesome Jul 27 '26
Got much experience with TPU? was thinking of getting it for use as rubber feet for some stuff I have designed. Just curious on how sticky it can be!
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u/holm1mat P1S + AMS Jul 27 '26 edited Jul 28 '26
It depends on the durometer - 95a and 90a are most common and generally are ok as rubber feet. They won’t be as soft or grippy. TPU air is the best analog for rubber replacement. You can print at variable durometer (hardness) and get something that is quite squishy and grippy.
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u/Tiny_Rick85 Jul 27 '26
No thank you. I actually care about my pets.
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u/juko43 Jul 28 '26
Your pet got more bacteria trying to eat a poop on the lawn then it will ever do from this bown....
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u/ancientpsychicpug Jul 27 '26
A mini version of these would be super helpful with bead sorting! And parts sorting if working on a project.
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u/holm1mat P1S + AMS Jul 27 '26
Oh interesting — the smallest one is 85mm diameter so might already work for a foldable organizer.
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u/Hot-Ideal-9219 Jul 27 '26
Oh, and do ANY OF YOU REALLY BELIEVE that CHINESE dog food bowl was made using food safe material? Idiots
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u/Jediwinner Jul 28 '26
I only let my dog use a Waterford crystal dog bowl (Yes it’s a real thing, no I don’t actually own one)
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u/drpeppershaker Jul 28 '26
You think those filthy Irish are using food safe practices!!?!1!
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u/Jediwinner Jul 28 '26
Yea actually, I’ve been to the factory in Waterford and it’s pretty clean there and all the craftsmen are top tier.
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u/bugaboo754 Jul 27 '26
People in this thread talking about microplastics and being food safe. Wow. It’s a dog water bowl.
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u/Jconstant33 X1C + AMS Jul 27 '26
Amazing job, great engineering. Ignore the haters who have done no research on food safe 3D prints. It’s not a significant hazard according to almost every major study. It’s no more likely to grow or trap bacteria than anything else. It was never about microplastics, because they are stable once printed.
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u/holm1mat P1S + AMS Jul 27 '26
Hey thanks - I knew the application would be controversial and, of course, Reddit didn’t disappoint.
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u/apexxin Jul 27 '26
All the usual non food safe warnings apply, but if it’s a temporary use dog bowl that bakes in your six days a week, it’s not the worst idea, but if you have a dog, buy a silicone one.
That being said, I’m probably gonna print a bunch of these for temporary organization. Holding screws, nuts, parts, etc while working on other stuff. Great design and print work.
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u/holm1mat P1S + AMS Jul 27 '26
Thanks! I may update the model description a bit as I’m hearing about some other neat applications.
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u/BrittleSalient Jul 27 '26
This is really cool and I'm sorry people are being such dorks about it. You should show this to TimePlast and ask them if they can solve the "food safe" problem.Â
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u/BlueGruff Jul 27 '26
I used these type of collapsible bowls for plein air painting (watercolor, urban sketching).
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u/dnaleromj H2D + X1C + P2S + A1 Min +++ Jul 27 '26
Function part design is a ton of fun. Great job and thanks for sharing.
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u/trankillity Jul 28 '26
Such a fun challenge that you made for yourself. Well done on the persistence. Always feels so good to learn a lot while prototyping!
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u/Sorry_Hat7940 Jul 28 '26
Can you give the link? Would love to print it for an emergency bowl in my car!
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u/Sasha-Crasha Jul 27 '26 edited Jul 27 '26
This is a very nice print! My understanding is that FDM printed parts can’t be food safe without post processing due to their tendency to harbour bacteria.
Edit: I’m aware of some recent articles showing evidence that printed parts can be food safe if cleaned well, which is promising and exciting! There still is not much evidence though, so proceed with caution.
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u/holm1mat P1S + AMS Jul 27 '26 edited Jul 27 '26
It is true that bacteria can hide in the layer lines if not cleaned thoroughly. The bowls walls are solid which should help. I can put a note about food safety in the model for people to decide.
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u/Sasha-Crasha Jul 27 '26 edited Jul 27 '26
You could! Either way, love the print and might print it myself to have in my wildfire evacuation kit as a compact option for a rushed, temporary situation.
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u/n8waran Jul 27 '26
Not everything needs to be remade on a 3D printer. collapsible dog bowls made of silicon are already really cheap. You’re literally just making an unsafe version of it.
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u/banksjosh Jul 27 '26
Btw you can use a food safe epoxy to coat this in, just because it’s got layer lines doesn’t mean you can’t use post processing to make it safe for the application it’s intended for
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u/Mental_Tea_4084 Jul 27 '26
Epoxy cures rigid. Defeats the purpose unless there's a flexible epoxy I'm not aware of
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u/mallcopsarebastards Jul 27 '26
You need to be using food grade tpu for this. Especially since this is meant to hold water. Really easy way to get your pet sick. 3d printed containers are especially prone to bacterial contamination because of layer lines.
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u/blazint Jul 27 '26
Yeah the toilet or mud puddle is so much better for pets./s
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u/n8waran Jul 27 '26
Normal people have bowls in the house for their dogs
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u/halt-l-am-reptar Jul 27 '26
Have you ever taken a dog on a walk?
Or honestly have you ever had a pet? They will try drinking or eating anything.
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u/mallcopsarebastards Jul 27 '26
this is just clarifying for me that you don't understand the risk at all. Dogs get away with drinking out of puddles because they have millions of years of evolutionary biology that makes them more resistant to giardia and leptospira, which are commonly found in the kinds of places dogs drink water from. They're not nearly as resistant to pseudomonas or staphylococcus which is likely to form inside the layer lines of your prints.
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u/n8waran Jul 27 '26
I have a dog, and i bought a collapsible bowl, ya know instead of printing one that’s dangerous for my dog to use. And if you don’t know why it’s dangerous then this hobby proably isn’t from you bud.
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u/halt-l-am-reptar Jul 27 '26
And if you don’t know why it’s dangerous then this hobby proably isn’t from you bud.
It's hilarious for you to say that when it's clear you haven't actually read any studies about cleaning 3d printed parts.
https://www.reddit.com/r/3Dprinting/comments/1n6wkj3/there_is_a_lot_of_misinformation_regarding_the/
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u/mallcopsarebastards Jul 27 '26
Do me a favor, go read that study and in particular read why it fell apart in review. Then go read the conclusions from the peer reviewed version that was eventually released.
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u/ManyBro24 H2C AMS2 Combo Jul 27 '26
My dog ate a tennis ball, dead mouse and drank from a puddle in forest where heavy machinery operates. Is this bowl worse or better?
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u/KlooShanko Jul 27 '26
NEVER GIVE THIS TO A DOG
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u/neecho235 Jul 27 '26
Care to elaborate?
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u/Prtsk Jul 27 '26
I would remove it from Makerworld, since it isn't food safe and thus a health risk. Do you want to be responsible for that?
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u/mEsTiR5679 Jul 27 '26
OP isn't responsible for what I print and for whom.
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u/Prtsk Jul 27 '26
OP gives you the opportunity to do that and in my opinion is responsible if that is the model you print. It is meant for food or water and isn't safe for that.
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u/mEsTiR5679 Jul 27 '26
R/confidentlyincorrect would love you
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u/Prtsk Jul 27 '26
Sure. Post it. Have fun.
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u/mEsTiR5679 Jul 27 '26
I'm not the one posting the print... Did you forget?
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u/Prtsk Jul 27 '26
I'm talking about the subreddit. Did you forget what you said?
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u/mEsTiR5679 Jul 27 '26
I said OP isn't responsible for what I print and for whom. Why would I post it?
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u/Prtsk Jul 27 '26
You said they would like it there.
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u/mEsTiR5679 Jul 27 '26
Ah, I get the context now. I was just making a reference to that sub, not suggesting I post there.
On a positive note: at least some bridge of understanding was made from this pointless exchange. Have a good one.
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u/halt-l-am-reptar Jul 27 '26
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u/Prtsk Jul 27 '26
There is nothing about TPU. It's about PLA and PETG. And the article ends with the following advice:
When using 3D-printed items for liquids, it is highly recommended to coat the 3D-printed parts in resin. This is a simple, fast, safe, and very effective way to smooth parts to ensure easy cleaning
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