Wilba: Yes, had to make some use of free 3d-printer access before I was kicked out of school after graduating, didn't know exactly what to do then other than some accordion inspired instrument with the ALPS-keys I got from an old silicon graphics keyboard. So the black and white ones were made then but when I made my PCB I screed up the key spacing a bit so I can't use them without the keys getting stuck because they are too tight, could always make a new PCB but while working on it I came to the conclusion that it's probably better to have rounded corners instead of a pure hexagon shape anyway. Makes it easier to press two keys with one finger without accidentally having the adjacent key follow. I printed a few Cherry MX compatible too just in case but not enough for a full keyboard, dunno if there's any good DIY mould making technique that could be used to multiply them, I'm guessing that it would be a bit expensive to use and 3D fab service or paying to use the school's printer to make more now that I'm no longe r student.
Anyway for my first jammer now I'm going with the green CNC-milled caps attached in a not to elegant way with "friendly plastic" and screws.
TAG: Seems like a solution worth investigating but I'm a bit concerned about having the second switch so close to when they key is bottomed out, should be variable though with some tweaks.