Ultimaker Retracting Z-Probe

UPDATE 2
Designed a folding post so your print area should be only minimally effected by this add-on. Moving the bed to the bottom deploys the post and after using the post to deploy and retract the probe, you can retract the post by pushing it up slightly.
http://www.youtube.com/watch?v=HJsdiVgMl-8

UPDATE!! Changed parts so they lock more securely by moving the magnet up. I also changed my post setup so it is actually screwed into the platform, as opposed to using a binder clip. Will up