GregValiant 1,342
When you say "turn on another printer" do you mean selecting Printer B from your list in Cura while Cura is sending Gcode over the USB to Printer A? Or do you mean powering on a second printer? I'll try to address the first.
You can try starting another instance of Cura and selecting Printer B there. That would leave Cura instance #1 alone so it can just be a host for Printer A. The com port to Printer A is busy so Cura #2 can't access it. Cura #2 will poll possible com ports for an available port and if you have a second USB configured as a com port for Printer B it MIGHT be found and printing to the port MIGHT work.
If printing from an SD card is an option then that might be the easiest thing to do.
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ahoeben 1,981
There is no way to specify the comport, there is only autodetection.
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