K8200 Micrometric Z home switch

Inspired from

http://www.thingiverse.com/thing:337998
and
http://www.thingiverse.com/thing:167650

I have designed an own solution as combination of both approaches. I have sliced with cura because of the inner diameter bug of slic3r. There is one critical zone which would support material normally. I have printed without support material (see picture - no risc no fun ;-) ). Could be that you need support material if you use an other slicer. The Micrometer I have used I shoot on Ebay f