My girlfriend makes a lot of art and I wanted to hang up her recent work on my walls. She had these adorable little canvases that were only 4mm thick, but there wasn't a good way to hang them since they were flat with no frame. Personally, I loathe adhesives like glue, tape, sticky tack, and command strips - they fail in high heat/humidity and they often damage the wall and the target object.

So I decided to create a parametric model in OpenSCAD that could be used to generate bespoke corner clips for mounting the canvases to the wall, and I ended up finding it highly useful for mounting other generally flat and rectangular things. I created some larger clips to display some of my favorite vinyl records, prominently showing the album covers while ensuring ease when rotating out or playing them.

The OpenSCAD model is based on a simple, 3-layer design:

1. A base triangle with a hole for mounting to the wall with a screw/nail (or optionally no hole if adhesive is desired),
2. A corner wall that is as thick as and is flush to the target object,
3. A customizable overhang that provides a slot to hold the target object.

Some caveats and considerations:

This parametric model served me very well for what I needed: a completely-customizable, form-fit, medium-duty, unobtrusive, wall-mounting solution for generally rigid, mostly rectangular objects. However, it's not perfect. In all of my use cases at home, I mounted each corner clip to the drywall with a single nail. Naturally, one corner clip can rotate freely without a flat, rigid item keeping a pair of clips level at the bottom. This is not an issue when in use and it actually helps a bit with installation, but frequent rotation of items will likely weaken the anchor point quickly and may cause the nail to loosen or fall out. For typical drywall installation, this model is probably best suited for semi-permanent displays. I thought about adding an optional second nail hole, but it just didn't seem worth it at the moment.

Additionally, I considered adding an optional countersunk hole for screws or nails, but I used flat nails and the impact was minimal for my needs.

I printed a handful of clips in various sizes in both PLA and PETG+ with similar results, and at the sizes I was dealing with they were effectively 100% infill (entirely wall/surfaces). It's worth noting that my printer tends to overfill small holes, so I oversized the hole diameter a bit. Just play with the generator to get what you need!

I printed in both base-down and side-down orientation without brims. Trust your slicer's auto-orientation and use your best judgement if you have any bed adhesion issues. 

Overall I'm delighted with this parametric model, and I am very proud of the results. For just a few cents worth of material, I love the value of this as a completely custom wall mounting solution! I hope that you find it both useful and stylish for your various wall-mounting needs!