This is a simple panel switch you can print, which uses a standard mechanical endstop (snap-action switch).
To assemble, first put the button piece inside the housing, then use two M2x16mm or similar screws & nuts to mount the limit switch inside the larger housing so that the lever arm of the limit switch is against the back of the push button. Easy!
download the files on: http://www.thingiverse.com/thing:1104383
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