eX_34

eX_34:

...not a silly pseudo-scientific name, just the iteration number. Yes, I've put a fair degree of effort in to this one - this is my daily driver for an extruder set up.

Update 30.4.19:
I've uploaded an improved version:
https://www.thingiverse.com/thing:3597342
The blurb below is still mostly relevant while the link above will take you to the update.

Goals:
-A robust, reliable extruder
-Capable of applying lots of force
-Compatible with any filament, including bendy stuff
-Filament run-out sensing
-Filament lubrication
-Easy to use
-No faffing with filament swaps
-Less prone to jamming
-Somewhat self-maintaining
-Reduce hot-end blockages
-Straight forward design
-Easy to print and construct
-A minimum of extra parts required

Tough list of requirements..? I believe I've succeeded, suggestions always welcome.

This extruder is intended to screw to a 2020 frame but I have included the .123dx file if alterations are required.

Construction, Extruder: