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Grbl does not support the M6 command or the T command.
You could use “feed hold” and “cycle start” to pause the carve. There is a software option (you can place immediate codes in your file or Post Processor) and a hardware option.
Keep in mind that some G-code senders do not send special characters to grbl and 1.1f uses the extended character set for immediate commands.
This article applies to grbl versions prior to 1.1f, which has the features mentioned, but uses different codes to activate the functions in 1.1f.
