I have tested these parts with 0.6 nozzle on Creality CR10 Smart using PLA+ from eSun on Amazon.

The box is slightly modified so no supports are needed but keeps it's rigidity.

The handle and lid need some supports. If somebody can remix these for no support build feel free to try.

All box parts are fully compatible with the Really Useful Box 0.3L boxes, lids and handles. So they can be printed in parts for replacements of fully for 1 whole box.

Current Amazon price is £35 for 20 boxes so this is a lot cheaper.

I plan on making more of the bigger sizes in due time so follow me for more boxes!