GregValiant 1,342
The printer is not a "printer". It is a USB Serial device so it is handled differently by the operating system.
There are a couple of things you can try.
You need an actual USB data cable. A lot of the cables used by phones are for charging only and don't have the transmit/receive lines in them.
With Cura running go to the MarketPlace and "Installed" (can take a minute to load) and scroll down to USB Printing and make sure it is checked.
Try different USB ports. If the USB-SERIAL (CH340) driver was installed on a particular USB port then it might not be available to other USB ports (my Win7 computer will only talk to the printer on a particular USB port but my Win10 laptop doesn't care which port I plug it into).
If you are on a Windows system bring up the Device Manager and then plug in the printer USB cable. The screen should flash and refresh and under "Ports (COM and LPT)" should be a line describing the printer connection as "USB-SERIAL CH340 (COM4) where the COM number is particular to your connection.
The Cura USB Printing plugin will search for a printer every 5 seconds (thanks @ghostkeeper) so you can have the printer plugged in via USB before Cura starts, or you can plug it in after Cura starts. It can take a minute or two for Cura to notice a COM port (as acknowledged in Device Manager) and then cycle through the baud rates until it finds what works.
Edited by GregValiant
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