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Roaddog Labs Bart Pro 300 Y axis Assembly

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Introduction |Frame Assembly |Y-axis Assembly | X-axis Assembly | Connecting X-axis and Z-axis | Heated Bed Assembly | Extruder Installation | Electronics and Wiring | Validation and Testing | Working with Files and Printing

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Y Axis Assembly

Print Bed Frame

Required parts :

  • 1 x print bed frame
  • 1 x Y belt bracket
  • 2 x M3 x 30 shcs
  • 18 x M3 x 12 shcs
  • 2 x M3 nyloc nuts
  • 18 x M3 nuts
  • 4 x M3 washer
  • 2 x M3 nuts
  • 8 x LM10UU bearing holder (2 per bearing)
  • 4 x LM10UU bearings
Y Belt Holder

Attach the Y belt bracket to the print bed frame using M3 x 14 shcs screws and nuts.

Insert an M3 x 30 shcs into the hole for the anchor screws. Use the M3 nyloc nuts and washers at the screw head and the nut.

Bearing Mounts and Bearings

Attach bearing holders to frame bed frame using M3 x 12 shcs and nuts. No washers are required.


Assembled print bed with Y bracket and bearings


Y Axis Motion

Required parts :

  • 2 x M10 x 511 mm precision rods
  • 4 x Y rod holder clips
  • 6 x M3 x 10 shcs
  • 4 x M3 nyloc nuts
  • 2 x M3 nuts
  • 4 x M3 washers
  • 1 m GT2 rubber belt (check length)
  • 4 small tie wraps
Y Axis Rods

Slide the precision rods through the bearings attached to the print bed frame. Set the print bed frame with both rods in the rod mount grooves on each of the front and rear plates.


Print bed with rods installed


File:Bart install Y y rods 1 300.jpg
Print bed with rods installed

With the Y motion assembly installed secure the rods using the rod clips and the endstop holder/rod clip. The endstop holder rod clip attaches to the left, rear of the machine. Use an M3 x 10 shcs and M3 nyloc nut for each clip, with a washer at the nut. Install the end stop as shown using two 2-56 x 1/2" screws and nuts, no washers required.


Y rod clips installed

Once the clips and endtop are installed run the assembly the length of the travel to ensure there is no binding. You may need to adjust the bearing holders on the bed frame assembly to align the bearings to reduce the resistance. The assembly should drop under its own weight.

Y Belt

Turn the machine so the bottom is facing you with the rear resting on the top of the main frame and the front of the machine (to you) on the front end plate.


In position for Y belt install

Run the GT2 belt through the idler bearing to the belt anchor screw on the bed frame assembly. Secure the belt to itself on the anchor screw as shown in the pic.


Attaching the Y belt to the anchor screw

Run the other side of the belt over the pulley on the motor so the teeth on the belt and motor engage. At this point make sure the motor is mounted all the way forward in the mounting slots. Y axis belt slack is tensioned moving the motor front to back. Run the belt to the remaining anchor screw and secure as in the previous step. Take as much slack out of the belt as you can. Check to make sure the pulley is aligned with the belt path.then tighten the pulley with the set screw on the D portion of the motor shaft. The belt should be tight with very little slack. Use the position of the motor in the bracket to adjust the slack.

Introduction |Frame Assembly |Y-axis Assembly | X-axis Assembly | Connecting X-axis and Z-axis | Heated Bed Assembly | Extruder Installation | Electronics and Wiring | Validation and Testing | Working with Files and Printing