I converted a dead Ender 3 into a heat insert press tool

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.