Compact bowden extruder for TinyBoy and Mini Fabrikator

I customized it for TinyBoy and Mini Fabrikator.

I printed it mirrored but you have to change the marlin firmware in configuration.h:
#define INVERT_E0_DIR true // for direct drive extruder v9 set to true, for geared extruder set to false
#define INVERT_E1_DIR true // for direct drive extruder v9 set to true, for geared extruder set to false
#define INVERT_E2_DIR true // for direct drive extruder v9 set to true, for geared extruder set to false

And the extruder needs 158 steps/mm