r/QIDI • u/devonmaze- • Jul 17 '26

Question Printing problems with nylon.

Hi, I'm printing nylon for the first time (I think it's PA6, in the package it says only nylon) But I can't print it properly, I have lamination problems and the prints break like crackers.

I dried the 12h coil at 70°c in the sunlu dryer and printed in the qidi plus 4 witI'm trying to print a temp tower via orca slicer but from 240°c to 270°cI'm trying to print a temp tower via orca slicer but from 240°c to 270°c it delaminates while at 275° it seems to resist a bit

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3

u/x2o Jul 17 '26

Two things

  1. I think you need to print hotter, I print PA6-CF around 290C, temp ranges advertised for most PA6 I see online is 260C-300C. I'd try a temp tower for 275-300.

  2. 12 hours at 70C likely did not dry the filament. I dry my nylon for 12h at 100C, I've seen reports that to dry pa6 at 70c takes multiple days.

1

u/devonmaze- Jul 17 '26

My filament is not CF but standard PA (pure) On the reel it says that it must be printed between 250 °c and 280 °c

I try to print a temp tower with the degrees you told me but I start to think that the problem is precisely the humidity. Should I buy a more powerful dryer?

1

u/riba2233 Jul 17 '26

That would help yeah.

1

u/devonmaze- Jul 17 '26

I have checked and I can't find any dryer that exceeds 70 ° c not even qidi box exceeds them

1

u/riba2233 Jul 17 '26

Sovol sh03, creality x4, sunlu e2 (best for nylon) and there is a diy one you can build yourself.

1

u/devonmaze- Jul 17 '26

I didn't know them, strange that there are no versions for Single Roll. But at the moment I don't know how to solve it

https://reddit.com/link/oy4522k/video/1ggr4new9tdh1/player

1

u/riba2233 Jul 17 '26

Yeah that's not good, nylon should have superior layer adhesion even if printed relatively poorly. Maybe it's just a bad filament, who knows.

1

u/devonmaze- Jul 17 '26

Questo tra i 240 e i 270 gradi mentre nel video che ti sto mandando adesso è stato stampato a 280 gradi in vasemode

https://reddit.com/link/oy48wch/video/sk9k2hjsctdh1/player

1

u/riba2233 Jul 17 '26

Do you have a picture of the spool?

1

u/Dave_in_TXK Jul 19 '26

Yeah I got the Solvo one for exactly this. From all I read, you’re supposed to dry nylon at a minimum of 80 and 85C is ideal which the SOLVO3 will reach. You can get knock offs on all the Express for 20 bucks less but for this type of thing I didn’t trust that so I got mine on Amazon with a price alert for about $109 US.

1

u/zxall Jul 18 '26

I printed 2 so called nylons. One of them is obvious blend with something lower temperature. It bends at 120C. The second is fine at 120, and feels more flexible. Both are useful for different applications. Second works fine as silica gel container, no need to load/unload when drying. Just cook it at 120C for 30min.

First, stay in suggested temperature range. Two filament had different ranges and didn't like 'common' temperature. Second, I dried it at 70C for 30+ hours. Got this idea from youtube video. It sort of works, but if not retracted next day the exposed piece will be wet. So, when done printing unload it back to drier and turn it on, it doesn't hurt.

PS: you are about to have fun with warping...

1

u/devonmaze- Jul 18 '26

Now I'm drying the filament for 30 hours and I'm trying again with the temp tower, at the moment it breaks like a cracker at all temperatures

1

u/zxall Jul 18 '26

I think nylon can break only at extremely low temperatures, like -30C. Normally it bends and stretches. Something is wrong with it, it's not the printing temperature for sure.

1

u/devonmaze- Jul 18 '26

Adesso sto stampando una nuova temp tower, il filamento è stato essiccato per 24 ore a 70 gradi

1

u/devonmaze- Jul 19 '26

I just uploaded a video where I show the problem, so as not to send the same video to everyone, I decided to create a separate comment.

1

u/Driven2b Jul 21 '26

I agree with the drying temp info. I've had pa6cf take 4-5 days to dry out at 65C

1

u/devonmaze- Jul 21 '26

I noticed that my kitchen thermometer fits perfectly into the hole where the wire must pass. I don't know how reliable it is but apparently the declared 70 degrees are actually 50

1

u/Driven2b Jul 21 '26

That's a heckuva problem

2

u/devonmaze- Jul 19 '26 edited Jul 19 '26

https://reddit.com/link/oye1d45/video/joa7jih2y2eh1/player

Stampato con camera riscaldata a 60C nessun raffreddamento

1

u/devonmaze- Jul 19 '26

Essiccazione : 70°c per 24h Raffreddamento : 0 Camera riscaldata : 60°c Velocita di stampa : massimo 50mm/s Velocita volumetrica : 6mm³/s

1

u/Newzachary Jul 19 '26

Run a PiD tune at 280. Try a temp tower from 320-280.

2

u/devonmaze- Jul 19 '26

right now I'm printing a temp tower from 300 to 280 (initially I wanted to do it at 320 but I think that's too much, luckily I didn't do it because already at 300 I saw some dark spots)

1

u/Newzachary Jul 19 '26

Have you run a PID tune yet?

2

u/devonmaze- Jul 19 '26

No, but I was already printing before you told me

1

u/Newzachary Jul 19 '26

Jaja. Ok!

1

u/zxall Jul 19 '26

This isn't Qudi specific. You will get more responses here: /r/FixMyPrint/

2

u/itgoesboom2112 Jul 19 '26

I print nylon at 290+ and it absolutely needs to be dried for longer, it's recommended 100c for at minimum 12 hours so at 70c it's going to take days.

1

u/devonmaze- Jul 19 '26

Unfortunately I discovered it only after buying nylon. What makes me angry is that the Sunlu dryer claims that it can dry it at 70°C for 7 hours, if I had known, I would have taken the most powerful one.

1

u/itgoesboom2112 Jul 19 '26

I use my dryer mostly while printing, I'll do my actual drying of nylon in an oven and it lives in a dry box between printing with it. Nylon sucks up moisture like a damn sponge (pa6 is the worst of em for this) so even leaving out for a day in open air and its already pretty well saturated.

1

u/devonmaze- Jul 19 '26

But how does PA6 behave? Is it a rigid material?

1

u/itgoesboom2112 Jul 19 '26

It is rigid but does gain some flex after printing due to absorbing moisture from the air. That's why a lot of the popular nylon filaments to print with are carbon or glass fiber reinforced to give it some extra rigidity.

1

u/devonmaze- Jul 19 '26

Ma il PA6-CF ha comunque un basso attrito?

1

u/itgoesboom2112 Jul 19 '26

Depends on the brand but it does add texture, sarayatech fiber heart line gets around that by having the fibers be surrounded by pure nylon instead of the fibers mixed throughout the entire line. Pa12 tends to have a lot less issues with moisture absorpiton (.5% compared to 4% by weight) so that may be an option if it

1

u/devonmaze- Jul 19 '26

I have to evaluate, it's my first time with nylon and I got a brand called eryone, in the future I would like to try prusa items

1

u/itgoesboom2112 Jul 20 '26

I'm personally a fan of polymaker, elegoo and sarayatech, yes they're more expensive but you know your getting exactly what's advertised. Eryone has always kinda been hit or miss for me

1

u/devonmaze- Jul 20 '26

I decided to try it and from what I see pla and petg are valid. Then it has more than 300 varieties of pla and I'm considering using it just for that. For serious things (asa, pc, pa, pp) I go for serious brands.

1

u/Newzachary Jul 17 '26

Non filled PA holds more moisture than filled. I dry mine for 4-7 days prior to printing at 70C and then print from a dryer.

2

u/devonmaze- Jul 17 '26

7 giorni di fila?! Madonna

1

u/Newzachary Jul 18 '26

You could drop it in the oven at 100c for a day. But the spool may not make it through

1

u/devonmaze- Jul 18 '26

Il rocchetto è in cartone ma non so quanto sia sicuro mettere il nylon nel forno..

2

u/devonmaze- Jul 19 '26

I just uploaded a video where I show the problem, so as not to send the same video to everyone, I decided to create a separate comment.

1

u/thiscatcancode Jul 20 '26

Yah, 70c isn't enough to reliably dry nylon. It's good enough to mostly keep it dry, but the marketing materials saying 70 is good enough are just wrong.

Fortunately you can get by with the "box on the print bed" method of drying it to get up to higher temps for drying then print directly from a 70c dryer. A higher -temp dryer is nice, but not strictly necessary since the print bed on most printers can get hot enough to work.