Simple print. Possible to use on bridges - light weight.

You need only one pen spring OR one rubber band. And small piece of filament if you want to glue the key into one piece.

Action is very nice, all simple and strong.

Video of the key action: Full key works so nicely. Half of the key does not work and is trapped forever in there (symbolic?)

Assembly before gluing with pen spring:

Assembly (before gluing) with rubber band:

Gluing

In case you are not experienced in gluing (super glluing), you can watch my gluing:

https://photos.app.goo.gl/sgXoNMGUYFTQLr8N7