Prusa i3 Direct Drive Extruder

This is a direct drive extruder system for Prusa i3. Best used with JHead style hot end and MK7 drive gear with NEMA17 Motor.
Has a built-in fan mount for active cooling the hot end barrel.
Designed for 1.75mm filaments ABS/PLA.

Use this with :

Minimalistic MK7 Replacement by whosawwhatsis (thing:15718)
MK7 Drive Gear
Prusa i3 Original X Carriage (Wide Version)
J-Head Style HotEnd
Compression spring with specifications listed in below

www.blomker.com

Specification for compression spring :
Material = Steel Alloy
Free Length = 30.5mm
Minimum Working Length = 19.9mm
Outside Diameter = 7.3mm
Wire Diameter = 1mm
Load at Minimum Working Length = 34.13N
Spring Rate = 3.26N/mm