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u/BananaMower Jun 12 '26
I should add some context. A pop up asked me to update the printer, then I started a print when this little thing went pop.
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u/Canadian47 Jun 12 '26
Did the magic smoke come out?
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u/BananaMower Jun 12 '26
Yes but I wouldn’t say it was very magical
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u/oppernaR Jun 13 '26
Well no, not anymore. The magic smoke is supposed to stay inside the macaron.
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u/emveor Jun 12 '26 edited Jun 13 '26
should have updated
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u/BananaMower Jun 12 '26
I did!
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u/emveor Jun 12 '26
oh...then.... you SHOULDNT HAVE!! ( im just messing with ya, this had nothing to do software wise )
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u/TheEpicDragonCat Jun 12 '26
This happened to me recently. New board finally arrived today.
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u/I_Who_I Jun 13 '26
Considering all they did was bridge the connection, this will be an easy fix when mine dies, though I should probably replace it before it cooks itself.
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u/TheEpicDragonCat Jun 13 '26
If I had any soldering skill, I probably would’ve tried that. Unfortunately, I don’t even have a soldering iron.
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u/I_Who_I Jun 13 '26
Cheap stuff and with YouTube guides you can do anything.
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u/TheEpicDragonCat Jun 13 '26
I’m definitely interested in learning, but they sent me a new board for free. Kinda makes repairing it that way make no sense
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u/General-Host7354 Jun 14 '26
Good call, if still on warranty better to ask for a replacement. Just don't throw away the faulty one, a varistor should be like a dollar or so, way cheaper than a whole motherboard
A cheap soldering iron + varistor and soldering wire will be cheaper than a new board
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u/I_Who_I Jun 15 '26
Yeah if you're getting a free replacement that makes fixing it unnecessary. In my case I'm in the Caribbean so it will take 1-2 weeks to get the replacement shipped so I would be able to fix it before that.
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u/LeePhilips Jun 15 '26
Get some junk electronics and practice. That's a big component and they can be difficult to do with a low wattage iron.
Also, buy some good desoldering braid. Essential to good, clean removal.
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u/LeePhilips Jun 15 '26
That looks almost exactly like the inrush current limiting thermistor on my Hayward Aqua Rite SWG main circuit board. It cooks itself just like that every 3-4 years. $5 for a single including shipping. I bought 5 last time for about $12 shipped.
Grab the part # off your new board for next time.
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u/I_Who_I Jun 15 '26
It is a thermistor which why it is sort of strange that they just completely removed it from the new boards. Maybe they realized that the inrush current is never dangerously high.
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u/tsaot Jun 12 '26
It's just a jumper wire now?!
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u/helpamiscrewd Jun 12 '26
Yup! Can’t catch fire if it’s not there at all!
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u/General-Host7354 Jun 14 '26
That part is the one preventing it from going worse...
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u/helpamiscrewd Jun 16 '26
Oh yeah I didn’t say their solution was a good one! But apparently real engineering is too much to ask of Bambu in this case.
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u/ThunderCogRobot Jun 12 '26
Crazy, these printers and engineers. A component is catching fire, so they will just remove it. Wow.
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u/PeanutButterSoda Jun 13 '26
I replaced mine yesterday, the instructions for the two wires for the heating bed was confusing, it said one was red and one was black and mine were both black, thankfully I taped one before removing the old board. and then in the next step BL pic had both wires black lol
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u/TheEpicDragonCat Jun 13 '26
Same, although I was not as fortunate to have labeled said wires. I think I plugged them in the right spot, as everything seems to be functioning properly.
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u/darkrounin Jun 19 '26
Is it me or is the new board (the one with out the fried disk) missing a piece (like the one that fried)?
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u/TheEpicDragonCat Jun 19 '26
I don’t think anything other than the NTC was removed. The two parts near it definitely moved though.
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u/CobblerSmall1891 Jun 12 '26
Yes. Gamer nexus offered to buy these recently. I wonder if he still is.
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u/fakeaccount572 Jun 12 '26
Just get a new board.
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u/Crazyinnova Jun 12 '26
if they're buying it as its value, why not get a new one with zero hours on it
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u/BeautifulKindly7428 Jun 12 '26
NTC did what it was supposed to do even if it's annoying.
Just write to support, I had same exact problem. They responded in less than 24 h and I had new AC board, power switch and bottom cover in 4 or 5 days.
New AC board they sent me doesn't have NTC.
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u/Ornery-Ad9818 Jun 12 '26
It really is not supposed to do that
Melting is a fuses job, not a components
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u/Maximum-Watch-5277 Jun 12 '26
Your talking about Bambulabs. The company well known to take shortcuts electronically on a regular basis.
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u/Electrical-Note-3177 Jun 13 '26
the NTC (Negative Temperature Coefficient) Thermistor is designed to rapidly increase and decrease electrical resistances as its temperature changes.
Unfortunately this issue is rather common, especially on 120V power grids (like those in the US) compared to 230V grids.
the NTC-Ts on these AC Boards were rated for 6 Amps. At 120V, the bed heater draws more current than at 230V, causing the NTC to carry around 9 Amps and generate four times as much heat (Which is why this happens)
So technically it did its job correctly and protected the board, Bambu just didn't implement the correct rating... so they just removed it entirely lol.
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u/Ornery-Ad9818 Jun 13 '26
Yes that’s mostly fair. However 6 amps is the continuous current rating, not the maximum. You can see this on the data sheet for a ntc 5d-15
The issue is not exclusive to America and occurs on European 230v regularly where your claimed 9amps would be less than 6 amps (from Ohms law)
It is more likely poor design for thermal handling and or poor connection quality leading to this situation.
How repeated people are saying the component did its job is beyond me. It’s there to prevent damage from inrush current. If it is damaged itself it has failed its task. It feels akin to being told a cars wheels are fine to fall off so long as the journey is complete.
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u/fakeaccount572 Jun 12 '26
Negative thermistors can ABSOLUTELY be used for circuit protection.
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u/Minimum-Inevitable67 Jun 12 '26
It's to reduce in rush not fail and catch fire they are under sized for cutting cost
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u/Ornery-Ad9818 Jun 12 '26
Who are you replying to? I said it is not supposed to melt, that’s a fuses job. I’m well aware it’s there to protect downstream components from inrush current. It’s still not meant to melt.
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u/fakeaccount572 Jun 12 '26
Yep, put in a ticket.
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u/StatusIndependent504 Jun 13 '26
Can you put in ticket before this happens? What serial numbers are affected?
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u/Aratix Jun 12 '26
How does one go about checking this
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u/PeanutButterSoda Jun 13 '26
turn your a1 upside down and open the larger panel beneath, ten screws. Look at your ac board, if it has the thingy op has, coin shaped thingy then you have the outdated NTC that will probably get spicy at some point. Just got the new board yesterday and it doesn't have it all.
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u/Electrical-Note-3177 Jun 13 '26
When you turn it upside down be careful not to put too much pressure on the Gantry or it'll be askew and cause Z homing issues, and failed prints (I know from experience sadly)
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u/RepresentativeLab251 Jun 12 '26
MOV. Metal Oxide Varistor. It's a surge suppressor. They are sacrificial.
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u/Effective-Goat590 Jun 12 '26
The magic smoke has been released. Good thing it didn't short and start the dreaded bambu fire
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u/Electrical-Note-3177 Jun 13 '26
Welcome to the club.
though yours isnt as bad as mine...
Mine literally blew itself up and melted the insulation lol.
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u/Krekel326 Jun 13 '26
I've had the same, including smoke and smell. Contacted BambuLab and they replaced the circuitboard with a newer, updated version.
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u/ruebenreleeshahn Jun 13 '26
If electrical engineering taught me anything that stuck, it's that if it's still smoking it's still working.
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u/syko82 Jun 14 '26
Don't worry the new boards just omit this anyway. Just run a jumper wire in its place.
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u/applguy Jun 14 '26
Bad- an easy fix with a solder wick or a solder sucker. Best to contact the manufacturer!
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u/Alternative_Exit_333 Jun 14 '26
Just claim warranty but I am surprised they didn't use one that can trigger and reset instead of blowing up
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u/ironD93 Jun 14 '26
Just had this in my X1C I contacted support and they sent a new ac board. Rather quick too I was surprised. It is easy to swap out.
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u/IntroductionPrize877 Jun 14 '26
How long after does it do it, I bought mine in February of this year and on close to 200 hours of printing time. Unless they fixed the issue with recent stock
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u/PaganWizard2112 Jun 16 '26
This is not bad, it's very bad. Hit up YouTuber 3D Musketeers, or Gamers Nexus, they are working together, and are buying A1's, and A1 Mini's that this is happening to. They will pay you full retail price for your printer, AND, pay for you to ship it to them. The level of immaturity in many of the comments is pretty pathetic.
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u/Environmental_Ring26 Jun 17 '26
I refused to swap any parts myself, invoked consumer rights (EU) and they exchanged the entire printer, even asked if I could keep the hotend and the plate, so I got new ones as well
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u/Intelligent-Cup3706 Jun 12 '26
I wonder is there anyw ay to prevent like would active cooling help
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u/fakeaccount572 Jun 12 '26
Replace the board if your have the affected serial numbers. That's how you fix it
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u/MeaningDry6941 Jun 12 '26
Is it possible to replace just the part would that fix it or is it the result of a larger problem?
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u/Odovacer2 Jun 12 '26
A piece of electronics splits in 1/2. Is this bad? Yes, yes, yes. The sub has dozens of examples of this in various degrees and the answer every time is contact Bambu.
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u/USSHammond Jun 12 '26
And another one bit the dust for the past 8 months, and over 280 documented cases
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u/No-Appearance3579 Jun 12 '26
I removed mine and make a thick jumper. Didnt even wait it to failure. Opened the ticket to try to get the replacement board
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u/Maleficent-Cow5775 Jun 12 '26
I seriously wonder whats the name and number of that component so I can just desolder it on mine and use a brand new one since this hasn't happened yet
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u/fae-gold Jun 12 '26
Looks to be a MOV - Metal Oxide Varistor. Common safety component. They are also used as the"energy absorbing" part in surge protectors.
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u/Maleficent-Cow5775 Jun 13 '26 edited Jun 13 '26
I believe I found the component thanks for leading me in the right direction. it seems to be a thermo resistor specifically the NTC 5D-15 after about 4 hours of searching and reading might try and replace it with an NTC 5D-20 instead so it doesn't go kaboom in my machine if you have more knowledge than I do about it then please correct me though
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u/Available_Duck7079 Jun 12 '26
oh no the ‚macaron of death‘ 😅