What size should the compartments be?

About 20 to 25 mm for small parts such as studs and 1x1 pieces, 40 by 50 mm for plates and tiles, and 60 mm or more for wheels and big pieces.

How thick should the walls be?

1.2 mm or 1.6 mm print cleanly with a 0.4 mm nozzle. Thinner walls are fragile.

Does the tray fit my printer?

The page shows the finished size and warns you when it is too big for a 256 mm bed.

Free brick storage tray maker

Sort your bricks into a tray with a grid of compartments. Choose a size, check it fits your printer, and download the STL. It all happens in your browser.

Trying it is free. Downloading needs a free account (just your email); Pro owners are not asked.

Printing it

Print it flat on the bed, open side up. It needs no supports.
Walls of 1.2 mm or 1.6 mm print cleanly with a 0.4 mm nozzle. A 20 to 25 mm compartment suits studs and 1x1 pieces.
Use PLA or PETG and 3 to 4 walls on the outside for a sturdy tray. A 0.2 mm layer height is plenty.
Several small trays often print better, and fit more drawers, than one huge one.