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Extrusion is different between usb and sd card

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I'm going to try my best to explain what is going on with my printer. I have a 2 Extended+ that I keep fiddling the bed on. Sometimes I think I'm too close and plastic doesn't come out, then I move it up and it comes out real thin and stringy. I tend to use Simply3D but have since moved back to Cura as I like the ease of first layer settings based in mm. I hate how Simply uses percentages.


Anyway, I loaded a model in the latest Cura and sliced it. While printing off the sd card the first layer lines come out thin and wiry and I can easily push it off the glass. To make changing settings quicker I decided to connect via usb so I can change settings and whatnot. Using the same settings as the original model, the first layer lines now go from looking super underextruded to being over extruded. It sticks really well to the glass and the lines come out thick and heavy.


What is going on? The printer is at work so I don't have pictures of both tests. The model was a simple zig zag to test bed level.


A few notes on the printer. I upgraded the extruder to the Bondtech QR from Matterhackers Here.


To change the esteps easily I changed the original firmware to the tynkergnome firmware. What I've been thinking is to go back to the original factory firmware from Cura and change the esteps using gcode.


What doesn't make sense to me is that it's been working really well since I installed it earlier in the year.


Anyone have any idea why printing over usb is so different than printing off the sd card?


Thank you,



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11 hours ago, niacobelli said:

Anyone have any idea why printing over usb is so different than printing off the sd card?


Hi Nicholas,


i can imagine three possible reasons:

  • the used gcode files are different
  • you try to print via USB with gcode flavor "Ultimaker" (instead of "Marlin")
  • some tools for USB-printing add their own start scripts / commands

Can you rule out these possibilities?

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Does Cura add different start up scripts over usb? I’ll change the gcode flavor to marlin. 


Obviously there is a difference, but why choose marlin  gcode over Ultimaker 2 in Cura?


Also, as an aside when I print from simply3d on sd and start a print it says it’s going to override settings and to select continue it cancel. When I select continue the screen moves over to cancel but still prints as usual. 


When printing from sd from Cura no such question is asked from the printer. 

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