Was designed as an enclosure for my relay board I was using for my create of the DIY Mr. Bullet Feeder on my LEE Reloading set up.
Attach the box to the respected area. The screw holes inside the enclosure are 1.5mm in size so use what screws you have that fit. After assembled, attach the lid and those screw holes are also 1.5mm in size. I used #6 1/2" sheet metal screws because that's what I had at the time. Works fine.
This is used in my OpenbulletFeeder- DIY Bullet Feeder build: https://www.thingiverse.com/make:578974
I suggest adding more walls and infill for long lasting strength.