I bought a piece of 1.5 inch stiff foam to try to fix a sag in a bed. It didn’t work but having that thick piece of solid foam around has been a life saver.
Need something flat to put a laptop on? Throw it on the foam. Going to be doing something that requires you to be on your knees for a while? Get the foam!
It went from stupid purchase to something I’d gladly replace if it broke.
A 3D-Printer, I thought I just play around with it and get bored, but you discover so many things that you can do!
The handle on the fridge broke? Print new ones. Need a Flowerpot? Just print one. The router needs a wallmount? I have one ready in a few Hours.
Also I can watch it print for hours, very fascinating and calming.