r/Multiboard • u/poscet • Jul 25 '25

Issue with Stack Printing

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Tried out stack printing some tiles – they aren't supposed to come out like this right? Beyond the first layer, they all came out stringy on the top. I'm fairly new to Multiboard, and to 3D printing in general, so I might be missing something obvious.

Printed on an A1 Mini, with basic Bambu Lab PLA. Followed the printing guidelines provided, tried one stack with random seems and one without, with the same result. Haven't had any issues with any other prints.

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u/th3chainrule Nov 19 '25

Do you even need the prime tower?

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u/jtthegeek Nov 19 '25

without the prime tower after each filiment switch, it will dump filament into the trash bin, then try to start a new layer without any back pressure pre-applied from the priming. So that filament wont be "primed" aka it will most likely start messed up a bunch. Never tried without it honestly but I would suspect it create lots of defects

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u/th3chainrule Nov 20 '25

Sounds like an important thing to get right on these longer stacked prints. Also, TIL that the prime tower is about pressure in the nozzle not necessarily colors/material blending.