[Arco] X/Y belt replacement

During FDM printing, the belts may wear out due to prolonged use or external factors, resulting in insufficient tension that can affect print quality and machine performance. To help you resolve this issue efficiently, we’ve prepared the following replacement guide.

Tools Required:

• 2.5mm hex wrench

Loosening Tension and Lock Screws

Rotate the tension lock screws on both sides clockwise to release them (do not remove the screws completely).

As shown in the image, in the released state, both tension screws should be positioned closer to the inner side of the machine. Ensure this before installing the belts.

Removing the Belt

1. Open the extruder’s magnetic front cover, disconnect the cable, and set the cover aside.
2. Remove the belt clamp screws.
3. Use a flathead tool to assist in removing the belt from the clamp (keep the old belt temporarily).
4. Remove the belt from the machine (consider taking photos or videos for reference).

Installing the New Belt

1. Compare the length of the new and old belts, and mark the new belt accordingly (this step is crucial — belt lengths may vary slightly between batches, and large differences can cause print failures).
2. Installation order: X-axis first, then Y-axis.

X-Axis Installation:

Left Side:

• Insert the belt from the rear of the machine, with the toothed side facing outward.

• Loop the belt in a “Z” shape around the left tensioning mechanism.

• Pull it forward and loop around the front flanged bearing.

• Insert into the left X-axis slider, and loop around the bearing.

Right Side:

• Loop the other end of the belt into the lower rear flanged bearing on the right side.

• Insert into the right X-axis slider, and loop around the bearing.

X-axis installation complete.

Y-Axis Installation:

• Loop the belt in a “Z” shape around the right tensioning mechanism, and pass through the upper flanged bearing.

• Extend forward and loop around the front flanged bearing.

• Insert into the right slider, pull the belt through, and align it parallel to the X-axis belt.

• Pass the other end through the rear left flanged bearing (X goes below, Y goes above).

• Insert forward into the left slider, keeping it parallel to the X-axis belt.

Extruder Belt Fixing:

• Clamp both belts into the belt clamp in parallel. The inner side of the clamp has teeth — align the belt teeth accordingly.

• On the right side, due to the cutter mechanism, insert the belt into the clamp as minimally as possible (see image for reference).

• Behind the cutter is a mounting base — secure the belt clamp there.

• On the left side, the optimal belt length is “three notches.” If everything is aligned, trim the excess beyond the marked length and secure it to the extruder.

• Loosen the tension lock screws to enter the tensioning state.

XY belt replacement is now complete!