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I received my FLSun QQ on Friday evening (10/26) and I’m having major problems printing using Simplify3D over USB using my laptop. I find printing with only the SD card to be very inconvenient and not a good option for me. I have not updated my firmware for the WiFi connection as I do not need that option at the moment. My main slicer choice is Simplify3D using PLA+ and while I have my settings nicely tuned, I keep getting an error saying “Echo:Busy: Paused for user” which I cannot get past. There are no messages showing on the printer LCD to respond to (screen doesn’t change from when printing to when error happens), and I can’t get past this message to continue the print with any commands in Simplify3D. I also tried printing with Cura (not terribly experienced with this program) and while I didn’t see an error message, my prints all stop at random times there as well. This has happened on every print I have attempted when connected to my laptop, sometimes after a few minutes, an hour, it’s always random. It has ruined every print I’ve attempted this way and wasted a lot of filament. Did you encounter anything like this?

Troubleshooting so far:

  • I’m sure my cables and USB aren’t a problem because I still use them on my other printer. I have tried multiple cables and USB ports. Baud rates all match.

  • I currently have not enabled the WiFi or updated the mainboard Marlin firmware

  • I had read that the “Blip fan power to 100%” option in Simplify3D can cause this issue, so I disabled that option, but it still did not fix the problem.

  • I keep seeing the M600 command can cause a pause in the prints but I’m not sure why this would come up now and never on my previous machine. My other machine does not have an LCD (needed for M600). My LCD never shows a prompt for any user input though.

  • I’ve read that the auto-level sensor can sometimes get triggered on different printers, causing a pause. I don’t think it should happen on this QQ since it has an inductive/conductive auto-level sensor I believe.

  • With a lot of back-and-forth on my laptop/Simplify3D/SD card, I got a part loaded onto the SD card and printed the entire part successfully. While very happy with the results, I still find this a far inferior method to printing using my laptop and Simplify3D when connected via USB.

Possible help?

  • Latest Marlin firmware for the QQ with M600 disabled? Is this possible?

  • Does the WiFi have to be enabled to get past these errors? I don’t see how this would fix it.

  • Disconnect the LCD to free up resources for the controller board, in case it is over-taxed?

Thanks for ANY help you guys can offer!

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Just a quick update: Unplugging the TFT touchscreen prevents the print failures. I’ve found that some people add switches to the power line of the ribbon cable rather than unplugging the screen entirely. FLSun sent me a firmware update for the screen as well, which they said would fix the issue. I’ll try it out and let you know if that works. I’d rather not have to splice into a brand new machine and add a switch if I don’t have to.

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First of all, I think you need the Wi-Fi to be enabled to resolve the issues and secondly, the firmware too needs to be updated for the Wi-Fi connection, whether or not you need it while 3D printing.