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Stepper Sync
In an AWD setup where two stepper motors are active on the same belt loop, a sync procedure is required to ensure a smooth operation.
Failing to do so this will results in a loss of torque and increased vibrations.
You can perform the following test to determine if the steppers are de-synced:
- With the steppers disabled, move the bed backwards. Pluck the belt listening to the tone.
- Run the "FORCE SET POS" macro, pluck the belt and listen if the tone changed.
- Keep plucking while disabling the steppers.
- If the frequency changes, that means the steppers are de-synced.
- If it doesn't, you can repeat the test with the bed in a slightly different position.
Note: you can use an app or some other method to get a reading of the belt frequency between disabled and enabled steppers, as described in the Belt Tension section.
The Stepper Sync process has to be done after re-tensioning the belt, in case of setup changes, or in case of skipped steps during printing or speed tests.
New setups in which the belt tensioners or the mounts have not settled in their final positions might require repeating the procedure at smaller intervals.
Process:
Note: the following procedure is done only on the front stepper motor. The rear one doesn't require any adjustments.
- Make sure that both grub screws of the front pulley tighten into the round part of the shaft. Use a Sharpie on end of the stepper shaft to mark the D location
- Disable the steppers and move the bed towards the middle, ensuring that the pulley ends up in a location where you have access to the grub screws
- Loosen up the grub screws and run the "AWD SYNC" macro a couple of times.
- After running the macro for the last time, keep the stepper engaged and tighten back the grub screws
- Disable the steppers
You can follow the steps described in the beginning of the page to check if the sync procedure was successful.