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Baja i3 Rework X and Y axis Motion

From Roaddog Labs Docs

Introduction | Bill of Materials | Y-axis Assembly | X-axis Assembly | Connecting X-axis and Z-axis | Motor Installation | X and Y-Axis Motion | Heated Bed Assembly | Extruder Installation | Electronics and Wiring | Firmware Configuration | Validation and Testing | Working with Files and Printing


X-axis belt

Needed parts :

  • GT2 Belt (900 mm)
  • Zip-ties


Step 1

Insert one end of the belt on one side of the X Carriage, do a loop and fix it with two zip-ties. The belt should be at the same level as the slot.

Step 2

Insert the belt either to the X End Idler or to the X End Motor depending to how you placed the belt on the previous step.

Do a loop, temporarily tighten the belt and insert it on the last slot of the X Carriage.

X-axis belt

Step 3

Tighten the free end of the belt and fix it with two zip-ties. Place the zip ties as close together as possible. If the other zip tie is too far out it could contact the pulley or idler bearing and reduce the amount of X print area. Once you install the belt you can move the axis along the full travel to insure the zip ties are in a good spot.

This step is difficult so please take the time to make a proper tightening.

Assembling X-axis belt, make sure you attach the belts as show or the X axis will move in the reverse direction.

Y-axis belt

Needed parts :

  • GT2 belt (760 mm)
  • Zip-ties

Step 1

Align Y Motor pulley, Y Belt holder and Y Idler bearing. The Y Idler assembly should be loose at this point. You can look down the center of the frame to eyeball the alignment.

Step 2

Insert one end of the belt on one side of the Y Belt Holder, do a loop and fix it with two zip-ties. As with the X axis, take care on where you put the outer zip tie.


Assembling Y-axis belt on Y-axis assembly

Step 3

Insert the belt either to the Y Idler or to the Y Motor depending to how you placed the belt on the previous step.

Do a loop, temporarily tighten the belt and insert it on the last slot of the Y Belt Holder. You can use one zip tie for this as we'll tighten it up after we align the belt path in the next step.

Y axis belt.

Step 4

Move your Y-axis near the motor. Adjust Y Motor placement to align the belt properly by moving the motor mount. When complete finger tight the motor mount bolts.

Step 5

Move your Y-axis the other way toward the Y idler. Adjust the idler placement by loosening the bolts and moving the part. Finger tight the bolts to the idler when done. Slowly move the Y axis back and forth the full length of the print area. You are looking for binding and grinding as well as the belt either not tracking straight or binding during travel. It may take a few trys to get this aligned.

Step 6

Once the belt is aligned, tighten the mount mount bolts and the idler bolts into the final position. Take the belt end that has one zip tie and pull the belt slightly tight. Install two zip ties as with the other belt attachment points.

Step 7

Use the M4 screw on the end of the Y idler to tighten the belt. It doesn't need to be guitar string tight, just tight enough so the belt doesn't skip teeth.