Surface Mounts

Helps to preserve surfaces by mounting things using nuts instead of drilling holes and ruining walls with screws.  Serves as a better alternative to marine canvas snaps.

Can be embedded with a nut, nut and washer, or flange nut.  Optionally reinforced with FRP for high-strength needs.

Fully open-source and customizable, designed with ShapeScript.

Printing

Use rigid filament (PETG, PLA, LW-PLA, LW-PLA-HT, etc).  Avoid carbon or metal additives if you're embedding metal hardware (to avoid galvanic corrosion).  Infill % doesn't matter if you're planning to reinforce it with fibers, but give it enough walls so that the nut doesn't strip the body and ends up spinning inside when tightened.

You can either print the model upside-down, or set a stop in the slicer right before the layer that puts the roof over the hardware, put the nut (and washer) in, then let the printer finish putting the top layers without need for any supports..

Usage

After gluing the surface mount, optionally reinforce it with FRP (e.g. Kevlar + Epoxy).  It can be done either with hand lamination or vacuum bagging.  The thread of the nut needs to be protected from resin, ideally by filling it with something water-soluble (e.g. PVA) that can be easily dissolved after the lamination process is complete and the resin is fully cured.  Apply thread-protective grease of sorts before laminating (to prevent resin from curing inside the thread).