Dual² Extruder, Single Nozzle dual extrusion Direct drive extruder - obsolete

Dual extrusion extruder with Dual gears, Direct drive, Single nozzle.

Design uses BMG gears (Triangle clones), Nema17 Pancake. Integratet 2-in1 Splitter using partially cutted PTFE Tube.

Single nozzle, Extruder gears are switchable with a small Servo (used a EMAX 3054, other with 28,5 x 13,0 x 31,1 mm and ~ 3-5 kg should fit).

Remark: you need at least Marlin-Bugfix as of Nov, 2022, previous versions had a bug with Single Nozzle/Dual Extruder.

Setup:

Add Parameters for Loaded Left/Right Extruder, e.g. for me I add the following to my slicer start GCODE:

M281 P1 L30 U140

(30° for T0, 140° for T1)

Filament Change GCODE

Something like that: (i need to retract 51mm to park filament in Splitter before the gears)

;park old extruder

{if previous_extruder==0 and next_extruder==1}G1 E-51{endif};

{if previous_extruder==1 and next_extruder==0} G1 E-51 {endif};

;change to the new

T{next_extruder}

{if previous_extruder==0 and next_extruder==1}G1 E51{endif};

{if previous_extruder==1 and next_extruder==0} G1 E51 {endif};

Design Fits EVA2, but can be adapted to others simply.

Category: 3D Printer Extruders