Spring loaded direct drive Mk7 extruder remix for Mark34

thingiverse

The stock extruder had trouble handling certain filament sizes, so I've put together this modified 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 on Github repository. This design can work for other printers too - but you'll need to attach something to clamp the extruder body like the mounting brackets do here. The bowden coupling works with either an M4 nut or the RepRap start brass piece shown in the picture. **Instructions** Keep using the original M4 screws and nuts for the mounting brackets, as well as the 608zz. Use a countersunk M3x10 and a socket head M3x25 to attach the extruder body. Attach the two idler halves with an M3x14 or M3x16 screw. For spring loading, use m2.5x25 (or a 20mm one if your spring isn't too long), four M2.5 washers and two nuts. You can get away with M3 here instead, but I haven't tried. The springs I'm using are 8mm long and have an ID of about 4mm. I used Slic3r 1.2.7 to slice my print at a layer height of .24mm and -0.12 xy compensation.