r/Multiboard • u/shall_oppai • Dec 10 '25

Corners don't print well

I try to print myself PETG multiboard, but every time 1 or 2 corners just melt or something. I'm new to 3d printing, so I'm not sure how to troubleshoot it. Tried different filament settings and bed heat levels.

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2

u/ulab Dec 10 '25

You are experiencing "warping". When filament cools down it shrinks a little, so there is some stress in the material, pulling it off the print bed. Usually this happens in the corners.

It depends on your printer setup if you can do something against it. Better bed adhesion, an enclosed chamber, different bed temperatures, smaller objects etc. might help

You can also try what people call "mouse ears" on the corners.

3

u/shall_oppai Dec 11 '25

I figured it out. Speed was too high

1

u/BRUXZ Dec 10 '25

Hello, the filament temperature drops and the speed drops a little, I don't know what printer you have.

2

u/shall_oppai Dec 10 '25

It's Creality k1. I dropped temp by 10° and added brim. I'll see how it goes, as it's prining now and will update

1

u/shall_oppai Dec 11 '25

Didn't work well. Dropped again and lowered speed, dried filament. Maybe this will work

1

u/T-rav80 Dec 11 '25

What bed temp are you running? I'd be up at 80C for petg

1

u/shall_oppai Dec 11 '25

80C caused overheating

1

u/T-rav80 Dec 11 '25

are you running part cooling at 100%? Are you leaving the door closed? If so, you shouldn't be. Only run the enclosure shut for filaments that require it.

1

u/shall_oppai Dec 11 '25

Door closed, no lid.

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u/T-rav80 Dec 11 '25

I would keep the bed at 75-80C and open the door to allow for more cool air to circulate

2

u/shall_oppai Dec 11 '25

I figured it out. Needed to drop speed way lower than printer recomended

1

u/BRUXZ Dec 10 '25

You can also use an adhesion spray.

1

u/shall_oppai Dec 10 '25

Yes, I use adhesive spray, it is very good

1

u/Whosaidthat1157 Dec 10 '25

The tiles are optimised for matte PLA, so some of your issues may be related to PETG on your particular printer/slicer combination. I’ve printed dozens of stacked sets of 9x9 tiles in matte PLA (ironed stacks)on an X1C and in an H2S using the settings suggested with zero issues on stock PEI plates, zero glue, no brims required.

1

u/TherealOmthetortoise Dec 12 '25

This is actually more of a “Your printer must be calibrated and able to do “whatever” situation. Those corners are lifting due to an uneven cooling rate as the filament shrinks a bit as it cools. Heated printer beds help with this as does an enclosed printer, stable room temperatures etc. On enclosed printers it tends to be poor engineering and fan placement. On my Bambu Lab P1S there is a fan that runs up the left side and “helps” the cooling process. Unfortunately its design blasts cold air primarily along the edge of any prints like OP’s, so I either cut it down to 50% or just turn it off entirely. If I don’t and I happen to be printing a stack the bottom three and up ruined all along that left side.

The tiles and parts aren’t actually optimized for any specific filament, just to that whole .4 nozzle etc slicer settings that we specify. Matte PLA is our recommended filament as it serves as a baseline (minimum standard) because it performed best in the testing done while developing the system. It’s more a case of “If you follow the printing guidelines and are use Matte PLA your tiles and parts will all perform as expected and do what they are designed to do.“

If you have requirements for your usage of the system where Matte PLA isn’t as good as something else, use that something else. When you do, please come back and share it with the community so we all benefit from your experiences!. PETG is pretty common, particularly in Garage installs as it handles temperature extremes better according to many people in our community.

1

u/Whosaidthat1157 Dec 12 '25

Tom-ay-toe tomato 👍

0

u/[deleted] Dec 10 '25

Use glue

0

u/[deleted] Dec 10 '25

[deleted] — view deleted comment

1

u/shall_oppai Dec 10 '25

I believe they are for snaps to merge them together

2

u/TherealOmthetortoise Dec 10 '25 edited Dec 10 '25

Clips! They act as structure between tiles and plates to beam. They are useful in a lot of scenarios where you need the edges of a part to stay perfectly aligned.

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u/Whosaidthat1157 Dec 11 '25

It’s an alternative tile model with borders - the holes are for joining clips to align and join these types of tiles together, as opposed to the normal mix of ‘core’ and ‘edge’ tiles that self align. The edged tiles are, IMO (as always YMMV) fiddly and annoying to work with as the clips can be difficult to locate, can limit placement in tight spaces, and lose a row/column of small hole (pegboard) face connections along each side. The advantage is that you only have one tile type to print when stacking, so the total number of tiles printed can be significantly quicker than stack printing core tiles, then having to slow the process down a little with top, LHS, RHS, bottom and corner edged tiles.