Used these to hold several reels of filament for a Prusa Mini. Perfect for feeding into the side of it. Just need a few screws to mount these to the legs of your Ikea Lack enclosure.
I think I printed these (.4 nozzle) .2 layer height with 20% infill double wall. Could print them a little beefier, but have had 4-5 spools on it and have had no issues.
Need a section of 1" PVC pipe to set on these holders.
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