https://www.thingiverse.com/thing:6394749
I used as few non-Ender 3 parts/screws as possible.
Reused the X carriage as the Z carriage for the soldering iron.
I’m really happy with how it turned out.
STP file at the link in case you need to modify it for your particular Ender 3 parts.
It’s for inserting brass threads into 3D printed parts squarely. More info on heated inserts here: https://www.cnckitchen.com/blog/threaded-inserts-for-3d-prints-cheap-vs-expensive
Thanks. Neat