Common Software Connection Issues

Have you tried turning it off and on again?

My printer's COM port is not listed!

Make sure you have refreshed the COM port lists, by clicking the refresh button next to the COM port listing in Config -> Printer Settings. If your COM port is still not listed, make sure you have the proper drivers installed.

I get an error saying my COM port/usbserial does not exist!

If you get a warning that whichever port you have selected does not exist, select the correct COM port under Config -> Printer Settings (or Ctrl-P on Windows, Command-P on Mac).

To make sure you have to correct COM port, first be sure to refresh your COM ports to have the most recent listings. You can either test all the different COM ports, or (for Windows users) check the Device Manager for installed COM ports.

If you are still having troubles, you may have some issues with your drivers.

I'm getting an error:System.IO.Ports.SerialErrorReceivedEventArgs!

This is a rather generic error message, so it can be hard to diagnose the exact problem. The first thing to check, however, is that all the printer settings are set correctly. The most common issue is a wrong baud rate, which should be set to 250,000. For a complete listing of the settings, see the following article: Repetier Host Printer Configuration.

If all settings are set correctly, make sure your drivers are properly installed.

It connects, but my printer isn't responding!

First things first, make sure your printer is properly plugged into the wall. When the printer is connected to the computer via USB, the motherboard lights will turn on and the host software will connect, but the printer itself will not respond. Make sure the light on your power brick is on and, if your printer has them, the LED lights inside the printer as well.

You may also be connecting to the virtual printer. The virtual printer will say it is heating both the extruder and bed, and all the commands will go through without error, but your actual printer will not respond. Check under Config -> Printer Settings to see if your port is listed as Virtual Printer. If so, select your actual printer and connect.

If you are having trouble finding your COM port, see above.

Repetier Host says the heaters are on, but my printer is still cold!

If your heaters are not responding, you could be connecting to the virtual printer as above. The virtual printer will say it is heating both the extruder and bed, and all the commands will go through without error, but your actual printer will not respond. Check under Config -> Printer Settings to see if your port is listed as Virtual Printer. If so, select your actual printer and connect.

The temperature of my extruder is fluctuating a lot!

While not ideal, some minor temperature fluctuations may occur. If your temperature fluctuates more than 5 degrees Celsius in either direction, try running a PID autotune.

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