openGrid Lockable snap with M3/4/5 bolt

Modified version of the beta openGrid lockable snap, with variations to put an M3/4/5 nut in one side and bolt through the other side.

Made this to support mounts for some heavier/awkward items, particularly the Honeycomb Alpha/Bravo flight controls which I still wanted mounted under my desk after switching to the (amazing) openGrid and Underware mounting system.

Fit for nut is tight but secure, with normal clearances for the through-bolt. I've printed these in PLA+/PETG/ABS all print and support just fine.