By changing a few settings my 3D printed Void Switches can be cut down to 18mm from the bottom to the top of the keycap. I just uploaded some pictures so you c

By changing a few settings my 3D printed Void Switches can be cut down to 18mm from the bottom to the top of the keycap. I just uploaded some pictures so you can see how low profile they can get: https://imgur.com/a/GejwL34 https://imgur.com/a/GejwL34 You could probably shave off another 1-1.5mm by printing some parts in resin (or switching to a teeny tiny nozzle) but I don't think that's enough to warrant the complexity or difficulties it would introduce during assembly. For going shorter than that you can cut down the travel (the switch in the picture is 2mm of travel if memory serves), use a shorter keycap/stem, or go with a completely different mechanism (I have a few ideas but haven't had a chance to try them out yet).