OK so an update:
I collaborated with my engineer friend and he did a sketch for me in autocad, this is the result converted to sketchup:
https://3dwarehouse.sketchup.com/model.html?id=ub5ef03bd-fad5-4053-ae8f-69d77ee6c4fe&uploadsuccess=1Not sure why the middle plate is missing, it was visible in autocad, I will try and amend this with him.
Considerations:
1. Can anyone here certify that the dimensions are correct for the male and female connections? We used
http://i.imgur.com/K5kui2s.jpg for keycap hole dimensions but there didn't seem to be dimensions online for the mx stem dimensions but we used the dimensions from this
https://3dwarehouse.sketchup.com/model.html?redirect=1&mid=81cf92a3e03098a5cc90be332989df6e&id=81cf92a3e03098a5cc90be332989df6e2. This is our idea of an extender but we are open to changes as we have really no idea what we're doing but during the designing these problems occured:
a. The middle layer is in 0.4mm in this prototype, really thin. We don't know how precise a 3d printer is so we don't know if it's too small of a detail. We also don't know how thick the middle layer has to be for the extender to be stable/usable, feedback on this would appreciated if anybody has any idea.
b. the mininum extension is 3.6mm since that is the length of the stem/hole of the keycap. If one would want to extend any less one would need to saw off the stem of the underlying switch and make the female of the extender shorter. Or one could make the male of the extender shorter and put some filling in the hole of the keycap used, but I think that is a less attractive option. However I strongly suspect that a 3.6mm extension is too long, what I really need to know is what the difference in height is between E and F profile keycaps, I really can't read it out of these pics from cherry, pls help
:
http://cherrycorp.com/wp-content/uploads/2014/12/12.gifReally hope someone can help me with these