It sounds like your Trevo Flash 3D printer is having communication issues between the printer and your computer or controller. The errors you're seeing:
<div>
</div><div>Error: No Line Number with checksum, Last Line: 14
Error: checksum mismatch, Last Line: 14
Resend: 15
</div>
...usually point to corrupted or incomplete serial communication. Here are a few things to try:
Check USB Cable – Replace the USB cable with a high-quality, shielded one. Cheap or damaged cables are a common culprit.
Try a Different USB Port – Preferably one directly on your motherboard if you're on a desktop.
Lower Baud Rate – In your slicer or host software (like Pronterface or OctoPrint), try lowering the baud rate (e.g., from 250000 to 115200).
Update/Reinstall Drivers – Make sure your USB-to-serial drivers (like CH340 or FTDI) are correctly installed.
Try a Different Host Software – Sometimes switching from one (e.g., Cura) to another (e.g., Pronterface or Repetier-Host) can resolve odd comms issues.
SD Card Print – Try slicing your file and printing directly from an SD card to bypass the computer entirely and see if the issue persists.
If it works from SD but not over USB, the issue is likely with the cable or port. Let us know how it goes!
