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can't connect to Cura but printer is actually connected.

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Hi all,

hope you can assist me....I am having this issue to connect my Ultimaker 3 to my mac.

It only appeared today as yesterday the printer has been working fine. Not sure what is happening.

Basically the printer is connected , but when i go to Cura properties / printers it is listed but i can't connect to it.

Please refer to Snapshot below to view the issue...


I am thinking to  try to reinstall Cura maybe downgrade to 3.4 ? (ATM i have latest version 3.4.1)


Did any of you had the same issue?


Many Many thanks



Screen Shot 2018-08-28 at 22.21.58.png

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Cura team doesn't appear to spend too much effort on printing through usb as only the UMO supports that anymore.  Cura is mostly just a slicer.  I recommend you use Cura to slice and for printing through USB you use pronterface.  It has so many more features.  Or use octoprint and you can print through your network (purchasing a raspberry pi and octoprint costs about $35 per printer).

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Hi all,


when i down grade i had no more issues with Wifi, I only have one printer really not sure why it was not connecting.



thanks a lot for suggesting octoprint , i will check it out looks super useful.

does it allows you to remote check while printing?

Does it allows you to log in to their website and check live your prints progress through the Ultimaker camera ?



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Octoprint does not use any hardware on the UM3 but the camera attached to a Raspberry Pi. It is not an online service that you use but a small application which runs on the Raspberry Pi mini computer. You then connect the printer to the Raspberry Pi via USB.

I wouldn't recommend OctoPrint for an UM3 but rather for the UM2(+) since the UM3 has a working remote printing feature through Cura (and Cura Connect).

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