Parametric universal spool adapter
thingiverse
The included STLs work with spool holes of diameter 40-80mm and thicknesses of <80mm. The axels that stick out the sides have a diameter of 13.625. By default it's calculated by the major diameter of the threads, a tolerance, and a set axel wall thickness. The code that creates the threads is reeeally slow, sorry 'bout that. You can remedy that by increasing the thread pitch.
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