flexi-bot/docs/marlin/_gcode/M028.md

tag	title	brief	author	requires	group	related	codes	notes	parameters	example
m0028	Start SD write	Start writing to a file on the SD card	thinkyhead	SDSUPPORT	sdcard	M29 M928	M28	Requires [`SDSUPPORT`](/docs/configuration/configuration.html#sd-card) Use [`M928`](/docs/gcode/M928.html) to log commands to a file during printing.	tag optional description B1 true Set an optimized binary file transfer mode. (Requires `BINARY_FILE_TRANSFER`) tag optional description filename false File name to write	pre code Start writing to file.txt M28 file.txt pre code Start binary writing to file.txt M28 B1 file.txt

This command starts a file write. All commands received by Marlin are written to the file and are not executed until M29 closes the file.

With 'B1', set an optimized binary file transfer mode. (Requires BINARY_FILE_TRANSFER)