DoublyDrivenExtruder

Doubly Driven Pressure Adjustable by Nema11 Motor and filament feed rate sensor.

Shapeways
http://shpws.me/TxWz

DoublyDrivenExtruder
Two bolts drive the drive_pulleys that drives the filament into the hotend . Driven by a gear set and belt and one nema17motor.

Pressure Adjuster Reduces pressure in rotations of stepper.

Feedrate Sensor Uses a continually rotating high precision 100K potientiometer

Marlin Firmware and Closed Loop Stepper Motor https://reprap.org/forum/read.php?415,855273

Marlin/Marlin/Configuration_adv.h


Extruder(E0) Enable Pin
External Pin to signal move complete
https://github.com/pghauff55/DoublyDrivenExtruder/