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  First, you need to do a few cleanups

  on the printed extruder drive.

  This is the main body with two

  608ZZ ball bearings already installed.

  We recomment to ream out all

  the small holes with a 4mm drill.

  Slide the two M4x60 bolts in with

  the head into the hexagonal

  pockets on the main body.

  Make sure they are diagonally.

  If these are too tight to fit,

  use a wing nut to tighten it

  from the other side.

  Don't use excessive force.

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  This is the idler.

  Put a 608ZZ ball bearing onto a M8x20

  grub screw and push it into the slot.

  We recommend to ream out

  the small holes with a 4mm drill.

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  Insert two long distance bolts

  through two bottom holes.

  Tighten them with M4 hexagonal nuts.

  If you have, we recommend to put a bit

  of bolt lock onto the nuts.

  This picture also shows the idler installed.

  Slide the idler over the two M4x60 bolts,

  put a spring and a wing nut on it.

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  Loosely mount the Nema

  17 motor onto the body

  by screwing in 4 M4x8 bolts

  through the long holes.

  We need to find out the

  optimal position for the gears,

  yet, so make sure the bolts

  are into the threads on the body

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  Insert the hobbed bolt into the big gear.

  Insert that into the two bearings

  on the main extruder block.

  Then find the small gear.

  If you haven't already,

  carefully ream it out with

  a 5,0mm drill bit.

  Then, mount it onto the motor shaft.

  Slide the motor with the small

  gear attached towards the big gear

  and try to move it by hand.

  If you push it too much,

  it will provide a resitance.

  When happy, secure the

  bolts on the motor.

  First, secure the two that are

  accessable with the gears attached...

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  ... then take both gears off and

  tighten the other two bolts.

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  Push the small white PTFE tube

  with the funnel-like

  opening into the extruder block.