Belt Installation Y Axis

Assembly

Belt Clamp

Type	Item	Quantity
Hex Nut	M3	2
Screw Button Head	M3 8mm	2

Belt Tensioner

Type	Item	Quantity
Hex Nut	M3	4
Screw Button Head	M3 12mm	2
Screw Countersunk	M3 10mm	2

• Glue the hex nuts into the sockets of the belt clamp (Left) to prevent them from falling during installation
  • Don't worry if the bottom part cracks or breaks. It is not structural, and only meant for ease of assembly

• Attach a screw to the hex nut and push it inside the tensioner (right). Some force might be needed.

Tip

• The rear belt clamp can be installed before mounting the carriage onto the mounts

• To pull the belt though the carriage hole once the carriage is installed, you can insert a narrow piece of tape though the carriage hole and then tape it on both sides of the belt to pull it though.
  Pull the belt though.

Y Belt Tool - For Setup and Tightening

• One side helps with pre-tensioning the belt and securing the nuts in place for attaching the top tensioning plate
• The other side is helps aligning the hex key for tensioning the belt with the bed mounted

Hardware

Item	Quantity
Heat Insert M3 Short 5x4	2
Nut Hex M3	7
Magnet 6x3mm	2
Screw Button Head M3 20mm	2
Screw Socket Head M3 40mm	1

Procedure

• Loosen the grub screws of the front Y stepper motor pulley
• Insert the hex nuts into the tensioning tool and set it in possible
  • If it's blocked by the carriage, lift the front of the carriage a bit until it clears it

y_belt_a1.mp4

• Pull the belt tight and hold it with one finger on the carriage
• Set the belt onto the tool and loop it though the hole and under the edge of the carriage
• While holding it, attach the top part of the pre-tensioning tool and lock it in place.
• Rotate the tensioning knob until the belt is tight

y_belt_a2.mp4

• Insert the adjustable belt clamp (make sure the screws are flush with hex nuts)
• Secure the top plate

y_belt_a3.mp4

• Remove the tensioning tool
• Move the carriage back and adjust the belt tension by using the two screws in adjustable clamp
  • Note: You don't have to use the tensioning like I do in the video. That side of the tool is mainly intended for tensioning with the bet attached.

y_belt_a4.mp4

• Finish by performing a step sync procedure and secure the grub screws of the front pulley.

Tip

• A piece of Kapton tape can be added on top of the tensioner block to ease the movement and apply more pressure.
• A strip of PVC tape can be added on the CF carriage where the back of the belt touches to increase pressure and friction.

• Due to the heat proximity of the assembly, it is highly recommended to replace the printed top tensioner plate with a ~1.5mm drilled PCB (FR4) plate, or aluminum. Make sure the screws have enough clearance from the heater, not to damage it and cause a short.

A custom FR4 PCB Plate design can be found in User_Mods: Y Tensioner PCB Retailer Plate

Belt Tension

• Please refer to the Tuning Guide for setting the belt tension and stepper sync.