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How to Print with the USB

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Correct. If for example you have a 3 hour print it will probably take 1 hour to load the whole print through usb onto the SD card. So this option is available through a few suppliers like doodle3d.com but not through Cura which is more of a slicer than a printer controller. Maybe you should look into octoprint. If you buy a raspberry PI for like $30 you can put octoprint on it and control your printer that way - through a web page - it's very nice.

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That's what doodle3d does I think. At some point it's all loaded onto the SD card and you can disconnect USB mid print. But like I said - it takes something like an hour to load a 3 hour print onto the SD card (about 1/3 through the print).

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No, I mean so in cura you slice it, then you drop it to the sd card, then you use take out the sd card out of your pc and then you connect the usb to your printer and computer and then how do you start the print with a command on cura to get the gcode to your printer with the sd card?

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Yes, Octoprint can start a print that has been saved to a SD card.

You don't install Octprint on your Robo3D printer. You install it usually on something like a Raspberry Pi and connect the Raspberry Pi to your Robo 3D (assuming the Robo has USB). See Thomas' great tutorial here:

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