Summary

Remix of printable line trimmer spool, modified to accept 3mm trimmer line. For ultimate line trimmer inception, I printed this using 1.6mm nylon trimmer line! make sure to thoroughly dry it first, and it is a cheap source of small amounts of nylon line at a moments notice.

Per the original part, additional walls in the top few layers for strength and abrasion resistance, printed with supports underneath, none in the middle. Using a nut, bolt and some washers to take the bump abrasion in use, but its cheap and easy to print a replacement anyway.