These printed perfectly, and the bins stack together solidly. Very sturdy design. I used a 1.6mm shell and .8mm bottom thickness. I printed 2 with the straight sided design. Next I'm going to print one with the sloped side to keep screws and small objects in when disassembling and repairing things. Highly recommended design. I printed a 6 slot, sloped end version but cut the Z height in half to 15 mm. Should be fine for holding small items for projects. Still stacks perfectly.