For a Reprap-fab.org hotend and for Prusa i3.
It's based on Josef Prusa's compact-extruder. Now it is for a 30mm distance between support screws.
It seems to work ok.
Uncomment the idler command in the source code to get one too. Another compact extruder
is licensed under the Creative Commons - Attribution
4 w x
6.69 d x
1.575 w x
2.634 d x