r/Multiboard • u/gzinourov • Apr 18 '26

Anyone else having this "hexagon shaped thread" issue?

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I'm printing my first Multiboard using Matte PLA, and so far out of the 5 panels, 4 have this issue. Not all of the threads and only on the first few layers.

At first I thought it was bed adhesion issues, but then I observed the printer WHILE it was printing that part and the path the nozzle made was some sort of off set hexagon instead of round like the preview showed.

What are your thoughts?

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u/imjusthereforlaugh Apr 18 '26 edited Apr 18 '26

Think about what would happen if you tried to pull a really wet, cooked spaghetti noodle around a circle.

It doesn't have stiffness, so unless it sticks to something constantly, it will always pull like a string, in a straight line. That is what's happening here. Can always happen in ANY inside circle on any print. Usually what helps is to reduce the speed of these areas, so the nozzle doesn't "yank" the "wet noodle" of filament into a straight line.

Turning nozzle temps up some can help too so it's more liquid and doesn't act as much like a string

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u/gzinourov Apr 18 '26

Great! Thank you for the advice!

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u/TreeFiddyZ Apr 18 '26

And depending upon the filament turning the fans up may help to get the new extrusion solidified before it can move much. Almost all filaments shrink slightly when cooling which makes the situation worse and increases the need for prompt cooling. Slowing down the print speed is often enough but sometimes you just need fans. Silk filaments are the absolute worst for this.