Alpha Piezo Hotend Z-Probe Mini Groovemount/Titan 20mm piezo

Update 14-05-2017 This unit is now in release candidate and is available here:
http://www.thingiverse.com/thing:2319993
Also available to buy ready made at http://www.precisionpiezo.co.uk/shop

Update 16-7-17 latest thinking in terms of firmware setup can be read here http://forums.reprap.org/read.php?1,767998,page=9

Update 07-03-2017 Made a version for titan (or generic groovemount) where the top piece is two parts (instead of 3). Should be quite tight in the groovemount. Print it 100% i