Gridfinity Paint Pen Holder
thingiverse
This 1x1 Gridfinity module holds paint pens in 15mm vertical tubes. You might have noticed that Sharpies don't work well on many FDM prints - the ink follows the fine details and spreads out. Paint pens work much better. DecoColor paint pens and competing generic brands have bodies that neatly fit in 15mm tubes. Prints easily without supports. I used .2mm layer heights, but I don't think it matters. The version in the photos was printed with Locyfens Rainbow Sparkle PLA.
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