This is the gearing file i use.
You just need to change the spur gear sizing to get the roll out.
Normally, i will up 2 pinion size for every change in motor-turn for a start.
example - if i am using 20pinion for 10 turn motor, i will change to 22turn for 11turn as a start out. Further fine tune during the run.
Also, I kept a copy of the roll-out for various common spur size as a reference.

Hope this will be useful.....