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.
I used FreeCAD to create my objects. It has quite a steep learning curve but it works for me.
I heard good things about TinkerCAD which should be easier to use for some quick ideas.
Thanks, will take a look!