Extrudle

Extrudle:
4.3.19 - I've re-uploaded the files with versions that have slightly less tight tolerances to make construction a little easier.

...an extruder full of yummy goodness.

Yep, there must be more extruders on Thingyverse than there are stars in the universe. Here's my take:

-Easy to print
-Easy to construct
-Readily available parts
-Easy to use
-Excellent traction
-Flexi-filament compatible
-Built-in filament run-out sensing capability

I've tried a few of your usual suspects and come to the conclusion that nothing beats the good-old compact extruder concept, as long as it's done right. I like to think my take on the design is a good one and comes with the added bonus of supporting filament run-out sensing if you want it...

...in addition to the obvious parts you'll only need:
-A tact switch - any 7mm square one will do but I like the 8mm tall version as it's easy to set up.
-Two lengths of wire to run from the switch to your driver board
-A quick tweak