Prusa i3 Rework X and Y axis motions

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Introduction | Bill of materials | Y-axis assembly | X-axis assembly | Connecting X-axis and Z-axis | Motor assembly

X and Y-axis motions | Heated bed assembly | Extruder assembly | Electronics and wiring | Marlin Firmware

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.

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

Assembling X-axis belt on heated bed mount.

Y-axis belt

Needed parts :

  • GT2 belt (760 mm)
  • Zip-ties

Step 1

Return your machine and align Y Motor pulley, Y Belt holder and Y Idler bearing. The Y Idler assembly should not be fixed.

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.

The belt should be at the same level as the slot.

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.

Y axis belt.

Step 4

Move your Y-axis near the motor. Adjust Y Motor placement to align the belt properly. This helps to avoid some friction of the belt (I spent 45 minutes trying to make step 4 and step 5 perfect and you just aren't going to get it perfect so do the best you can to keep the belt from hitting the sides of the GT-2 pulley and/or the Y Idler when you move the plate along the Y-Axis). Make sure that both bolt couples are aligned. Tighten the nuts with hands.

Step 5

Move your Y-axis at the opposite and do the same operation. Repeat the step 4 and 5 until your Y belt is properly aligned.

Step 6

When the belt is aligned, tighten the free end of the belt, and fix it with two zip-ties. Slightly tighten the belt, and cut both ends if necessary.

Step 7

An M4x20 mm screw located on the Y Idler allows you to tighten the belt properly, but be careful because it is not necessary to strongly tighten the belt as it has to be a little loose.