Ok there are tons of possible problems.
Does replicator-G actually connect to the bot?
If so, what driver did you choose in replicator-g?
Did you properly edit the Cupcake.xml? (Note this could cause an issue with the step above)
Try downloading another clean version of Replicator G and using it. Most likely, you messed up the Cupcake.xml.
This step is very critical but not the best explantion or example.
Configuration
RPM control in RepG Control Panel
Because a stepper extruder uses RPM instead of PWM values to set extrusion rates, you'll need to configure ReplicatorG to recognize this for your bot.
This page shows how to get RepG to show an RPM box (and ignore the PWM box) when controlling the stepper driver.
Basically, you'll want to:
•Open your machines.xml (or similar, depending on your version of ReplicatorG).
•Make a copy of the <machine> descriptor that matches your machine prior to the MK6.
•Give it a new name like "Cupcake with Stepstruder and ABP", depending on your configuration.
•Add a motor_steps="3200" to the toolhead definition.
•Restart ReplicatorG and select the new entry from the Machines | Driver menu
