I’ve looked around for these but couldn’t find anything to link my shelving bays. I have a few side by side, and due to whatever is on them, they never line up, which was bothering me. This way, they would all be interconnected in one piece.

They allow 7 mm between bays, which is the same distance at the bottom legs where the rubber/plastic caps sit together. I’ve put one triple pin in the top front and another at the top back, and they all have a 7 mm distance between bays from top to bottom.

For shelving that has 33mm between holes, 11.5mm pins and 1mm shelving steel thickness.

I believe the 3-pin option makes them sturdy, however, a couple of the 2-pin spacers will also do the job.

Done it in PLA with 3 top/bottom layers, 25% infill, and outer brim.