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In theory retracting hot end should allow for higher quality prints and faster printing. This type of retractable hot end would allow that the printbed remains fixed and further increase precision and speed. Nozzle "dragging" should be eliminated in both printing and inactive extruder nozzle in dual hot end setups.
D3D is developing this technology and it could get on your printer soon ...
There are many shoulds and woulds, but the video looks promising ... as always, future will show if this product will make satisfied buyers ...
http://www.dglass3d.com/
Update (1.5.2014.):
Here is new video of hot end in action:
Update 2 (21.5.2014.):
It is on Kickstarter now:
http://diy3dprinting.blogspot.com/2014/05/dglass-3d-autolift-precision-hot-ends.html
