* ''This command can be used without any additional parameters.''
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***Example***
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* M702
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In contrast to M701 this code is intended to unload the previously loaded filament from the selected tool. RepRapFirmware will do the following when called:
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1) Run the macro file "unload.g" in the subdirectory of the given material (e.g. /filaments/PLA/unload.g)
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2) Change the filament name of the current tool, so it can be reported back to Duet Web Control