5. Pulley sets

Lubrication

• Toothed idler 20T B5 (3)

• F604ZZ (16)

• 604ZZ (8)

Although the pulleys have been lubricated in the factory, for high speed printing it is still recommended to add a few drops of light oil before assembly and constantly maintain.

Rear pulley sets

For 1 secondary belt tensioner (optional)

• HK0408 bearing (2)

• Bolt m4 x 25 (1)

• Nut m4 (1)

• Printed belt tensioner (STL here. A newer, easier print design has been updated in Oct 11, 2022)

Prepare 2 sets.

For 1 rear pulley set

• Rear pulley housing (1)

• F604zz bearing (4)

• 604zz bearing (2)

• Bolt m4 x 45 (2)

• Nut m4 (6)

• Washer m4 x 9 x 0.8 (2)

Prepare 2 identical, but not mirrored, rear pulley sets.

Exams

Pulleys should rotate freely.

(Drop the middle 604zz bearing if you want to use 6mm XY belts and further reduce some moving inertia 😁)

Belted-Z pulley sets

1 Z top pulley set

• Z top pulley housing (1)

• Bolt m5 x 40 (1)

• Thin nut m5 (2)

• Toothed idler 20T B5 (1)

Prepare 3 pulley sets. The left and rear pulley sets are identical. The right set has a different bolt orientation to prevent collision with the driving pulley.

Exams

The bolt head orientations are different.

XY joiners

XY joiner

• Aluminum XY joiner block

• F604zz bearing (4)

• 604zz bearing (2)

• Bolt m4 x 45 (2)

• Nut m4 (4)

• Washer m4 x 9 x 0.8 (3)

Prepare 2 identical, but not mirrored, XY joiners.

Exams

Make sure pulleys are correctly placed in the left and right XY joiners. Pulleys should rotate freely.