Zheng3 Tinkeriffic 40mm Spool Spindle
by zheng3, published
This is a spindle for 40mm spools.
Combine with some Tinkertoys and you've got yourself a handy way to feed another color into your printer without removing existing spools.
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No construction necessary. Print two and fit onto a 1cm shaft.
Depending on your printer's fidelity, you may want to wrap a piece of tape around the inner shaft of each spindle to ensure a snug fit into your spool.
I use a strip of painters' tape on each spindle. Works great.