Improved Spool loose end clip
thingiverse
After printing the probe spool by xboxhacker (https://www.thingiverse.com/thing:3022528), I decided to print the loose end clip by sneed424 (https://www.thingiverse.com/thing:5192702). The loose end clip kind of helped, but it still kept slipping off itself. I took sneed424's original design, made it a bit longer, and added two dimples that catch on the holes on the spool holder. Now it holds on great with no problem.
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