I made this shelf to store some stuff around my printer like a scraper or pliers. Its printed in place without supports.

It's usable in two orientations, you could stack them like in the render image.

I used mirror tape (double sided foam tape) to attach it to the wall. I pretty much covered the whole back with the tape to make sure it never comes loose. Clean the back of the print and the surface you are sticking it on with (preferably) some isopropyl alcohol to make the tape stick better.

I scaled this down to fit in a 250x250 bed. The one on the photo is 300mm. I'll include a split in half file so you can print it in two pieces if you want it bigger.

I would love to see some reviews :)