A tray for the kitchen sponge, and that is exactly what fits: one sponge, room enough that it does not slide around, no room for much else.

Three raised ribs run along the bottom, so the sponge sits above the water that drains out of it instead of soaking in it. That is the whole point — a sponge lying flat in its own puddle stays wet and starts to smell.

Size: 154 x 99 x 27 mm outer, 2 mm floor. Low enough to pick the sponge up with one hand, deep enough that it stays put.

It started as a campervan fix — our sponge ended up everywhere except where I wanted it — but it does the same job on a kitchen worktop, in a caravan or a boat galley.

Printing: no supports, no brim needed. 0.2 mm layers, 2 walls, 15% infill, around 1.5 hours. Use PETG if it will stand in water every day; PLA is fine for everything else. Prints in one piece on any A1 or P1 sized bed.

Designed in MakerWorld MakerLab with Make My Desk Organizer. Want another size? Say so in the comments and I will add it.