KIS extruder - direct drive Nema 17 & Mk8 for 1.75 filament

KIS-(Keep It Simple) Mk1 extruder for 1.75 filament

Using ideas from all over the net i have developed a simple adjustable tension DD extruder based on a Nema 17 & Mk8 filament drive bush.

The push fit for bowden tubes is based on the items supplied by E3D with their V6 kit.

The fitting sits in a 10mm dia hole 10mm deep and once in place a 2mm drill is used to drill through the printed holes and drill the sides of the push fit fitting. Following which 2 short lenghts of 1.75 filament can be inserted to secure the fitting in place. In itself quite secure and stable but to be on the safe side i use a small amount of hot glue as well.

Parts list

Mk8 drive bush

Spring ( 8mm OD X 18mm long)

Allen socket head M3 X 20mm > 3 pcs

Allen socket head M3 X 16mm > 1 pc

Allen socket head M3 X 12mm > 1 pc

Allen socket head M4 x 10mm > 1pc

M3 plain washer

SKF bearing 624-2Z

As an alternative spring guide bolt, a single Allen head M4 X 10 can be used ...(same bolt as holding the bearing in place) (as in the phtoto) in place of the M3 X 12 & M3 plain washers

Update 8th April 2015> Lever and body updated to R1

Minor geometry updates to improve pinch action on filament

Update 5th Apr 2015 > added a couple of simple bracket options which both require longer screws ( M3 X 25)