Marlin has a feature that can execute a G-code file from an SD card when printer is turned on; this is called Autostart.

Autostart is available on printers with an SD card reader. If auto0.g exists on the card, the printer will recognize and execute it on bootup. Thereafter, if there are files with incrementing numbers, e.g. auto1.g, they will be done in incrementing order.

Name your file auto0.g and it runs when the printer is powered up. auto0.g should execute first then auto1.g then auto2.g etc. Mine will only execute auto1.g and not the others. Any thoughts what happens here?

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    $\begingroup$ Hi Sea Wa, welcome to 3DPrinting.SE! Do the skipped files contain valid G-code? Are the files properly ended Unix/Windows line breaking? Files or SD-card corrupt? $\endgroup$ – 0scar Sep 3 '20 at 6:02
  • $\begingroup$ Thank you for you response. Could you please explain what the proper ending Unix/Window line breaking is. $\endgroup$ – Sea Wa Sep 4 '20 at 14:48
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    $\begingroup$ would it be practical to test each auto file individually prior to creating the cascade? $\endgroup$ – fred_dot_u Sep 4 '20 at 14:50
  • $\begingroup$ I tried auto0.g alone and it executed. I am using Marlin 2.0.6 0n a BTT SKR 1.4 Turbo with TMC 2209 drivers. One my Ender 3 Pro with auto0.g, auto1.g and auto2.g on SD card, it will execute auto0.g but not the others. $\endgroup$ – Sea Wa Sep 4 '20 at 14:54
  • $\begingroup$ what if you rename auto1.g to auto0.g and run it alone? If there's a problem with the code, it would appear. Each successive auto file could be tested this way. $\endgroup$ – fred_dot_u Sep 4 '20 at 14:57

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