I  needed to put a handle on something, this one is pretty simple. Holes should be a loose fit for 10/32 bolts, so use a fastener on the other side. May fit similar sized metric bolts. I may make a version without holes so it can be scaled to fit your needs.

Print on one of it's sides, this will minimize overhangs. The holes should still print fine. Printed with 30% grid infill for rigidity. Printed in PLA but stiffer filaments would work better.

Printed on my Makerbot Replicator 2

30% grid infill

no supports

bed adhesion of your choice