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This is a seriously nerdy question, that I initially asked in the discord. @reprapryn maybe you've thought of trying something similar for a flying extruder at some point?

I want to do something better than I have so far for a professional printer I'm building. It's a large format delta, and I want to have a webcam hooked up to Obico for failure detection. Now if I put the webcam at a fixed location on the printer, the failures can be either obscured by the print itself, or the print head. So to remedy that I want to slave the camera on an extra stepper to be at the same height as the print head. But I'm not sure how I'd make it so that a G1 Z<whatever height> activates both the A/B/C motors to move the print head, as well as the U axis that I'm thinking about creating for this. Would this be a macro, or is there some better way of achieving my goal?

This will be using the board from iagent.no for this (A7 boards should be available next month from what I know)

www.iagent.nowww.iagent.no – High end 3D printer electronics
Rep Rap Ryn :3
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@goeland86 I have been interested in this for a sort of live Z adjust feature for rotary and prismatic deltas to allow the bed to move using a scissor lift stage. Doesn't have to be fast as it only triggers off every 50mm, adjusts the z offset, and continues where it left off. Isn't connected to the kinematics so system doesn't care.