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Cura 3.4.1 + USB + Select Mini Pro not working

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Hi Ultimaker Community,

I just started to use the new Select Mini Pro and ran into the problem that USB printing doesn't work with Cura 3.4.1

It works with Cura 3.2 though!

In Cura 3.4.1 the printer never connects, in 3.2 it's immediately connected.

I tried to move the USBPrinting plugin folder from 3.2 to 3.4.1, but that sadly doesn't work and wrecks the newer Cura Version.

It seems that the plugin got updated in 2018 since in Version 3.2 it shows the last change in 2016.

Does anyone have an idea where I could check to get it working with the newest version?

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Servus Leberschnitzel,

I had exactly the same problem with a CR-10 after updatig to new Marlin-version.

The problem:

Cura 3.4.1 (actually it's plugin "USBPrinting") is now trying to autodetect the bautrate (different to former versions) by sending gcode "M105" (request temperature) at different baudrates to the serial port. It expects at least 3 successfull response lines containing the string "ok T:" - but Marlin is only sending 1 line matching this string - containing all temps (i.e. "ok T:27.03 /0.00 B:26.91 /0.00 @:0 B@:0\n")

The solution:

Change file C:\Program Files\Ultimaker Cura 3.4\plugins\USBPrinting\AutoDetectBaudJob.py (or whereever your Cura Plugin-dir is located) line 63 from:

if successful_responses >= 3:


if successful_responses >= 1:

...and restart Cura, which will then find the correct baudrate (propably 115200) and enable the serial communication

Edited by Olvin

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