This is designed for little objects with the inside having rounded corners allowing for those small contents to be easily removed with one finger. This is originally for small beads such as for making earrings, jewelry or other small objects such as screws or. The lid has a pass thru for the nut to be tightened against the tray itself. Eventually I'll integrate a stackable design. Printing all 3 objects at once, takes about 54 min on my K1Max. Any input is welcomed.