Drive block

You will need the following parts:

# Component Qty Type  408 NEMA 17 stepper motor 1 Electronics  242 M3x16mm cap head screw 2 Fastener  1239 Drive block 1 Printed 1255 Drive block spacer 1 Lasercut

Place the motor onto the spacer.
Attach the drive block using the two cap head screws as shown.

Idler bearing

You will need the following parts:

# Component Qty Type 279 623 bearing 1 Hardware  702 M3x10mm cap head screw 1 Fastener 258 M3 nut 2 Fastener 212 M3 washer 2 Fastener

Assemble the idler bearing with a nut and washer on each side of the bearing.

Lever

You will need the following parts:

# Component Qty Type Idler bearing 1 Assembled  1237 Lever 1 Lasercut  1238 Lower lever 1 Lasercut  702 M3x10mm cap head screw 2 Fastener

Slide the lever into place, insert the idler bearing assembly, then fit the top lever. Secure at the pivot point with a cap head screw. Finally, screw the remaining cap head screw up through both levers. The hole in the top lever is smaller than in the lever, such that the screw will bite into the plastic.

Spring assembly

ou will need the following parts:

# Component Qty Type 650 M4x35mm button head screw 1 Fastener 1193 M4 nut 3 Fastener 1185 M4 washer 3 Fastener 1250 Idler spring 1 Hardware

Fit the washer, spring and nut (in that order) to the button head screw.
Slide the assembly into the drive block as shown.

Hobbed insert

You will need the following parts:

# Component Qty Type  1181 Hobbed insert 1 Hardware 1183 M3x3mm set screw 1 Fastener

Slide the hobbed insert onto the motor shaft, then slip some filament through the drive block, to engage with the teeth on the hobbed insert. Add a small drop of thread lock (or superglue) to the set screw, then screw it into the hobbed insert and tighten onto the flat of the motor shaft. Take care not to strip the head of the screw.

Mounting the drive

You will need the following parts:

# Component Qty Type Fisher 1 Part-assembled Extruder drive 1 Assembled 1236 Drive spacer 1 Lasercut 152 Tongue 1 Printed 241 M3x20mm cap head screw 2 Fastener

Insert the drive spacer between the extruder drive assembly and side panel, then secure using the two cap head screws.
Push the bowden end into the drive block. This should be a snug fit.
Ensure the bowden start is fully inserted.
The tongue is used to retain the bowden tube during printing. Take care to orientate the tongue as shown.
Push the tongue fully into the slot.
Finally, push the extruder thumbwheel onto the end of the stepper motor shaft. This allows you to move the extruder manually, which is helpful when loading filament.	Picture to come