Spring loaded direct drive Mk7 extruder remix for Mark34

The stock extruder struggled with some filament sizes, so I have mashed together this combination of the original Mark34 extruder bracket and a mod of the spring loaded extruder from the SmartRap ( www.thingiverse.com/thing:177256 ) version 4.92 Github repository.

Could fit other printers too - but you'll want something to clamp the extruder body down like the mounting brackets do here.

The bowden coupling works both with an M4 nut and with the RepRap start brass piece I have on the pictur