I have a generic printer with no support documentation.
How do I determine what firmware is in use so that I can research how to make the print run?
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M115 to the printer. This command is
Request the Firmware Version and Capabilities of the current microcontroller.
ok PROTOCOL_VERSION:0.1 FIRMWARE_NAME:FiveD FIRMWARE_URL:http%3A//reprap.org MACHINE_TYPE:Mendel EXTRUDER_COUNT:1
For more info see here, RepRapWiki- G-code - M115: Get Firmware Version and Capabilities.
Of course, this isn't guaranteed to tell the truth, just whatever your generic clone firmware had in its source code.