I have already done a auto bed leveling setup on the current printer but it is not that great, since it is servo driven it is really far away from the nozzle and for some reason the firmware is having issues with it being so far away so as part of the new configuration of the XY axis mechanism I am incorporating a new auto bed leveling probe into the carriage/head design.
I have some piano wire that I use for push rods in my model airplanes and I was goofing with a piece when I noticed that if I drilled a hole up through the heat sink of the hotend then I can have the probe really close to the nozzle, the wire is metal and is passing through the heat sink so any heat it picks up will be dissipated by the time it gets up to the top.
So my thinking is to have a plastic collar at the top that the wire goes through and locks into that has a tab on one side to break the light beam of an optical sensor to be triggered, that will be encompassed in a spring loaded casing that when deployed a servo will push it down into place and then let it spring back up when it is done.
More on this as I go and get it figured out.
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