3d printers are great.

I attempted to productize a super niche idea I had for myself that I have ended up using multiple times. It's a simpler method of running wires without having to cut/patch drywall and drill through studs.

It started with trying to create a router-like device equipped with a motor (which was version 1 [1]).

But then iterated it to be a plate which can be attached to existing routers. That resulted in a drastically improved user experience which went from doing it all inside and making a mess to doing it in your garage with more precision. I've used the final design on 4+ projects at home and it has saved me so much time [2].

[1] https://www.dropbox.com/scl/fi/i5p330nqo0cfrfx3gxf05/Wiresha...

[2] https://trywireshark.com (includes diagrams and videos of what I 3d printed)