I feel like I'm so close to having my Mk4 working on my Creality K1, however when it goes to the switch, instead of doing a "home" first it cycles through to Random (From what I'm seeing watching the screen) Then when it would normally load, the screen cycles through as though trying to select extruder and goes through all options to the 'No Command' so that when the printing should start there's no filament actually loaded. I switched to the PrusaSlicer-2.7.4, and am using the profile from https://www.printables.com/model/653583-3dchameleon-mk3-installation-for-the-creality-k1-a for the k1 (not max) so not sure what to do, though the listing is for the Mk3 and I'm wondering if that's where I'm falling down. I was under the impression from posts with Bill that that was correct, so if there's a better profile for the Mk4 please let me know.
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Your timing is off in the tool change gcode, and possibly the start gcode. Make sure you adjust them to match what your specific 3DChameleon is expecting.
It's just the G4 commands that you need to look at. If it's pressing the button for too long (for the expected command), then shorten the timeout value of the G4 command... likewise, it it's too long, then increase the timeout value of it.
G4 is a pause command... it's how long it should be waiting. The profile on the Printables page hasn't been updated for the Mk4 yet... it's still using the Mk3 timing.
Bill