Thingiverse
Springy Spool Reducer for Wanhao, MP, and PowerSpec Duplicators by reactron
by Thingiverse
Last crawled date: 4 years, 2 months ago
This spool spring is designed to be used with the rather odd dimensions of the i3 spool holder. It will work with hatchbox and other filament spools of similar dimension. You need to print two of these and space them out inside the spool.