box fixing rail

Printing setting : Grid infill at 25 % standard qualitie 0.2 mm

Fastener required : 6 countersunk screws M3*30 and 6 nuts M3

You can skip the middle hold but it tends to bend

A clearance of 0.2mm is provided for fitting the 2 parts together

I designed it on Fusion 360 and i give you the file if you have modification to do