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Board mounts are best designed slightly larger than the footprint of the board, with a method of mechanically aligning the board to the screw holes for ease of manufacturing.
Boards should be mounted on standoffs with heat-set inserts. The standoffs should be just taller than that required by the length of the heat-set inserts to preserve stability.
Ask elec if there is a standard screw for board mount, if not, we may have to decide ourselves
It never hurts to add a bit of supporting material to the sides of the standoff
Size the hole to be slightly larger in diameter than the tip of the heat-set insert for alignment
Holes for heat-set inserts should be 2-3mm deeper than the length of the heat-set insert to make a channel for the displaced plastic to flow into so it doesn’t rise up through the center of the heat-set and block the hole
When 3D printing board mounts, or other large, flat objects, it is best to have rounded corners >=5mm in radius to disperse stresses from nozzle motion. This reduces the likelihood of parts peeling off the base
Boards should be supported from beneath in areas which will undergo high stress, e.g. by connectors, which will undergo stress when being inserted. The electrical team should be consulted on location of supports.