https://www.youtube.com/watch?v=JS1KrUXT-cs

As a mechanical switch, I use an Outemu blue switch (a clone of Cherry MX).
The most foolproof way is to use a switch that has walls on all 4 sides, I think it's called "dustproof", for example this one:

Use the Y mark on wood.stl and pencil.stl as a guide.

alu.stl must be glued to pencil.stl 💧

I also added a version with a spring, if you don't have a switch. Position alu(ver2.1).stl correctly relative to Pencil(clear2)wm.stl, otherwise the spring will not be able to position itself correctly inside. alu(ver3)ring.stl is a version with a ring if you want to hang it on a backpack.

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