Very nice! As I use a printer that has 3mm filament, I don't have any of the hinge material so I will have to figure something else out. I am considering redesigning the lid hinges to have slight bulges instead of holes so the lids clip on. I have had success with other hinges like that before.
Or I could just cut off the hinges and make the cover a slide cover (not as optimal). I will be sure to post if I have a chance to try any of this. It will be a little while due to relatives visiting.