WARNING: this step is crucial for proper functioning of the Multi Material Upgrade. Please check your alignment multiple times!!!
⬢Push the filament through the pulley body as in the picture.
⬢In case your filament is bent, make sure the bend points down, so the part above the pulley is straight.
⬢Adjust the position of the pulley, the teeth must be directly below the filament.
Check again the proper position relative to the teeth on the pulley.
⬢Make sure the lock screw is still perpendicular to the flat part of the shaft and tighten it. Use reasonable force as you might strip the screw.
⬢Repeat these instructions on the 4 remaining pulleys.