Needed to frequently transport this specific box with a heavy load and the cardboard couldn't take it. Used an utility strap to disperse the load between two printed handles. The holes are for an M4 screw and nut. Used plastic screws to attach the backing to the handle, no longer than needed for the thickness of the cardboard. (in my case that was 8mm)

Tenlog DL3

No

Yes

200

38

Use whatever infill you need. I did this one at 60%