Section 3.1 Assembly of the XZ Unit Mounting the X Axis

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	1x X-Motor
	1x X-Bearing Holder Left
	2x LM8UU Linear Bearing
	1x ACME Nut
	2x Torx 3x16 Screw
	1x 8mm Smooth Rod

• Put the linear bearings onto any of the smooth rods

  • This is to keep the bearings straight while you mount them.

• Put the bearings and the rod into the bearing slots of the X-Motor

• Put the ACME Nut into the slot of the X-Motor Holder

  • You can find the ACME Nut on the threaded rod of your linear stepper motor

• Place the Bearing Holder

• Fix the Bearing Holder with the two Torx screws.

• Remove the smooth rod

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	1x Hall-O Endstop
	1x Endstop Cover Top
	1x Endstop Cover Rim
	2x Torx 3x10 Screw

• Mount the endstop with its cover onto the X-Motor assembly.

• Don’t make the screws too tight.

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	1x Nema 17 48mm Stepper Motor
	1x GT2 Pulley

• Mount the pulley onto the motor shaft.

• Fix it with the two little set screws that you can find in the white bag in your RUMBA electronics box.

• The distance between the motor and the pulley is 4.5mm.

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	3x M3x10 Cylinder Screw
	3x M3 Washer

• Mount the motor onto the X-Motor holder.

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	1x X-Idler
	1x X-Bearing Holder Right
	2x LM8UU Linear Bearing
	1x ACME Nut
	2x Torx 3x16 Screw
	1x 8mm Smooth Rod

• Put the linear bearings onto a smooth rod

• Put the linear bearings with the smooth rod into the pocket for the bearings

• Put the ACME Nut in position

• Place the bearing holder

• Fix it with two M3x16 Torx screws

• Remove the rod

• Note: the bearings can move left and right a couple of millimeters (with some friction). This is to avoid load on the bearings that can be caused by tolerances in the length of the linear rods of the X-Axis.

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	1x X-Carriage
	1x X-Teeth
	2x Torx 3x10 Screws

• Pierce the holes in the X-Carriage.

  • The hole is closed of with one print layer for good print results. You can easily pierce it by pushing with a small allen key or screw driver from the other side.

• Slide the X-Teeth into position

• Fix the teeth with the screws.

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	3x LM8UU Linear Bearing
	1x 8mm Smooth Rod
	3x Ziptie 4.4mm

• Place the upper two bearings into their slots

• Slide a smooth rod through the bearings

• Mount the upper two bearings with a ziptie. Mind the orientation of the head.

  • If you don’t have a big ziptie, fix it with TWO small zipties for better stability.

• Remove the smooth rod

• Push in the lower linear bearing

• Mount it with a ziptie.

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	1x 8mm x 400 Smooth Rod
	1x 8mm x 343 Smooth Rod

• Slide the long (400mm) smooth rod into the upper hole of the X-Motor holder

  • Make sure it reaches to the end.

  • If it goes too stiff you can put the end into a hand drill. Do not use a hammer.

• Slide the short smooth rod in the the X-Motor holder

• Slide the X-Carriage assembly onto the rods. Mind the orientation!

• Slide the X-Idler onto the smooth rods. Again make sure that they reach until the end of the hole.

  • If it goes stiff make a light twisting movement with you hands while you push the plastic parts more and more together.

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