Filament rewinder
thingiverse
It's extension for Mega Anti-Tangle Spool Holder (https://www.thingiverse.com/thing:2479238) Once upon a time I got a 2kg filament spool which didn't fit on my printer, so I decided to rewind part of it on some old 0.5kg spool - but it was a nightmare. This is designed to work with a high torque motor (like this: https://tinyurl.com/y5vynevg) and powered by H0 electric train power supply to manage the RPM.
Download Model from thingiverse
With this file you will be able to print Filament rewinder with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Filament rewinder.