The Original Prusa i3 MK3 is the successor of the award-winning Original Prusa i3 MK2 3D printer.

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Raspberry Pi / OctoPrint via USB connection

I've already got an OctoPi setup running for my previous printer, so I know that works. It's a Raspberry Pi Zero W.

I disconnected the old printer and plugged it to the new Prusa i3 MK3 with the supplied USB cable, but can't get a connection to the printer. The Octoprint web client cycles through all the baud rates, and gives me a connection error. I've tried restarting the Pi and the printer.

Any suggestions? Do I need to enable the 2nd UART, like for the direct mount version?

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Hi Joey,

direct connection using USB should be possible, I'm running RPi 3 without any issues. RPi Zero W should work the same way. Check printer's menu, go to settings. Is your RPi port on or off?

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The RPi port should be on, as I've been using it with my other 3D printer. I'm not home right now, so I can't take a look at my printer's settings. Where exactly should that setting be for me to look for?

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RPi port was off, so I tried turning it on. No change. I assumed it was for the internal RPi port.

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If the RPi port is ON the printer expects RPi Zero W connected straight to the board if the port is OFF the communication is through the top USB. Try to use another SD card with fresh install of the OctoPrint.

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I have used Pi3 works fine, set connections to auto, only issue is print bed size is wrong.

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Joey Gil will be eternally grateful.
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