Ender 3 Pro Creality 4.2.7 Does not connect to Mainsail OS | Mainsail | Page 1

sterile phoenix Sep 26, 2025, 3:54 AM

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Setup

Keep getting "mcu 'mcu': Unable to connect"

Printer is able to flash back to Marlin no Issue

Logs and Config File included

📎 klippy4.log 📎 printer.cfg

rare current Sep 26, 2025, 9:47 AM

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Fix your tags. This is a klipper error. You even only sent a klippy.log

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It just looks like you flashed with the wrong settings

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Send a screenshot of the settings yo used to compile

sterile phoenix Sep 27, 2025, 5:26 PM

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When I check the logs section I dont see a klipper log itself just klippy, crowsnest, mainsail and moonrakeer

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I also tried with a diffrent 4.2.7 incase it was a board issue and i get the same result

#Ender 3 Pro Creality 4.2.7 Does not connect to Mainsail OS