Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4713051.

A light remix of https://www.thingiverse.com/thing:4558945 which is a remix of https://www.thingiverse.com/thing:4170300

After printing in speedy, aggressive 0.3, the spool wouldn't stay in.

I've simply lengthened the spool shaft, as well as made the top part of it slightly wider.

Depending on the type of filament you print this in, you might have to press it fairly hard, and give it a spin.