Kossel chocolate (paste) extruder conversion

Chocolate (pasta) extrusion module for Kossel 800.

28BYJ-48 converted to bipolar stepper and connected to extruders A4988 driver.
http://www.aliexpress.com/item/28BYJ-48-Valve-Gear-Stepper-Motor-DC-12V-4-Phase-Step-Motor-Reduction/32295584569.html

Big 100ML Syringe with nozzle
http://www.aliexpress.com/item/New-2015-Reusable-100ML-Large-Big-Plastic-Hydroponics-Nutrient-Measuring-Syringe/32440818115.html

12V Carbon heater for prolonged chocolate print
http://www.aliexpress.com/item/N