It postulates that you have the standard version of the Scalar S, and that you are upgrading your Y Axis.
This upgrade is a mechanical upgrade only.
It doesn’t require any firmware updates.
In order to continue, it’s best that you remove the belt already installed.
Keep it close as you will need it very soon.
Y axis positioning
Installation of the new axis
2 sides synchronization
Remove the black screw already in place.
Keep it safe for future use.
Take great care to the pulleys directions
Do not tighten the pulleys
Tighten the stabilization screws
These screws are here to stabilize the extrusion profile, to prevent it from rotating.
Back view of the printer, we install the M5x35 black screws that we kept from earlier.
New lower plate installation
Heat plate installation
This step allows to make sure that your bed is properly aligned to your chassis
This step takes into account that your pulleys are not tighten on their shafts. They must remain loose until the end of this alignment procedure.
Once you have checked that one side is aligned, you can tighten the red extrusion holders on the chassis on one side only.
Here we are tightening the right side. It will allow us to align the other side more easily
Hold the plastic support and tighten it on the chassis.
Now, slide again the bed toward the front of the machine this time. Once at the end, hold the plastic holder and tighten it on the chassis.
You can check that the bed is centered using the hotend. It should be able to move over the whole heatbed surface. You can adjust the position of the X end stop in order to fix potential centering issues.
Your heatbed should move freely back and forth with no issues linked to parallelism.
Also your bed should be properly aligned to your chassis now. You can check that by moving the bed edge to the front of your chassis. Using a ruler, you should see that the bed is parallel to the front of the chassis on both sides (right and left).
Tightening the Pulleys
Now that your bed is properly aligned and centered you can tigthen the 4 pulleys and you are done!