[Andrew Schuetze]

Not much help in terms of adding strength to the part, but do consider the printer orientation. The horizontal layers are stronger as there is entanglement within the layer as the abs is hot but much weaker due to less entanglement between the horizontal layers as they have cooled to some extent between passes. So think of it like a carpenter cuts a part out of wood which has grain.

Maybe you or the college has already considered that aspect. If not build them in two or three different orientations and see is one better than the other for your application.

Other thought is to build a metal shield of some type that doesn't interfere with ring grab and hanging but affords some level of protection from bumps in the field...

APS