Expected Command Letter Failure about octoprint-bettergrblsupport

[synman]

hmm.... curious what the significance of the "%" character is. Absent doing any further research at the moment, if you remove it from the beginning and end of your gcode file one of two things will happen:

1. (ideal path) all subsequent commands get parsed properly and you're a happy camper
2. we find another incompatibility between your gcode creator and the plugin's parser.

Here's existing logic for handling comments:

https://github.com/synman/Octoprint-Bettergrblsupport/blob/master/octoprint_bettergrblsupport/__init__.py#L433

[synman]

I'm going to filter out this character (line) when it shows up at the beginning of a line.

[synman]

so % is definitely part of the GRBL protocol. It signifies beginning and ending of a program (series of gcode commands). technically this is working as designed and the problem is on the ramps end of this.