I've got my regular 3axis CNC router working and I'm daydreaming here...

My sister makes cookies for a living and I've been watching her decorate cookies in 1-200 count batches and noticed something- she's doing a repetitive process with identical tool paths & patterns using a frosting with a consistent viscosity out of the same size nozzle...

I'm gonna give it a try. I think the best way is to put a peristaltic pump on a stepper motor and put a tube with a nozzle on a stick that I can Chuck into the spindle.

Where do I look to make a tool path that'll correspond an x y z tool path to spin that fourth axis? I can do the simple 2d trace and contour toolpaths in Fusion, but how would I add the toolpath for this pump axis?
Thanks!!

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