In that case, epoxy nuts underneath/to the case. < /pun > < /Neanderthaler mode>
Creating a dedicated thick, ABS printable nut designed to look "right enough" when MEK'd to the outside of the case might be a good solution?
1 - design the "case nut" with a pilot hole for 4/40 drilling and tapping
2 - print in ABS with cutaway clamping tabs (3D design spec is in flux ATM)
3 - buy 4/40 Tap/drill set
4 - clamp, drill and tap printed nut
5 - cut tabs away
6 - drill pilot hole in case with the matching tap bit (greater accuracy and less stress on case plastics)
7 - drill out pilot hole in case so a 4/40 nylon stud slips snugly through
8 - thread nylon stud into "case nut"
9 - snug "case nut" up to the outside of case with 4/40 nut inside the case (steel nut will do, nylon would be better)
10 - Solvent weld "case nut" to case plastics
11 - remove nylon stud (if it breaks off in hole nylons easy to drill out)
12 - drill out hole with tap drill from set for appropriate retainer machine screw
Designing and printing a "full nutting bar" would probably look more like it belonged there and be a much more robust solution. Definitely design and print a pilot hole drilling jig for inside the case while you're at it.
Now that I think about it (and taken a peek at the ass end of my 8500) solvent welding a full length strip to the case would definitely be a lot better. Do they make silver lookin' ABS filament?
Hope that's clear enough, it looks right in my head, but translating that into words is iffy at best. :blink: