I can control the MPCNC fine from LightBurn, but i get echo:Unknown command: 'G21 G54 in the console window whenever I move it. I can control the laser just fine via the fan speed setting on the LCD, and it also works from a gcode file saved to the SD card. I also changed the polarity on the TTL cable as they seem to have shipped backwards. I modified the FW to remap pin 9 (12v) to pin 44 (5v) to control the laser via TTL. ![]() I’m using a recently built MPCNC with a LA03-3500 3.5W blue laser from Banggood.Ĭontroller is RAMPs 1.4 running Marlin 2.0 (downloaded from the V1 Engineering website). ![]() ![]() Hello! I’m new to lasering, and I’m issues with the laser not firing when using LightBurn
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