I tried using the rotary roller but whenever I start. It says Cut mgiht be out of bounds. I pressed continue anyway but it gives the error below.
ALARM:2
G-code motion target exceeds machine travel. Machine position safely retained. Alarm may be unlocked. (Right-click the ‘Devices’ button to reset the connection)
On or near line 4:
Job halted
This sounds like you are using absolute coordinates. With a rotary, you should change the start position to “current position”, since the y-axis is endless, and it makes no sense to use absolute coordinates. Additionally, you might need to extend the y-axis maximum travel distance because it’s endless, as said.
How do you determine the Y axis mm per rotation? Most of the videos in the internet say they just hit and miss on the this part
That’s the most common way, but of course, this can be determined more scientifically 
I described the setup here (somewhere down the page): Rotary roller - Diode Laser Wiki
I found that jogging the rotary 3-4 rotations (like to the middle of the workspace) helps prevent the out of bounds message
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