# Printing from SD-Card crashed on USB connect

**URL:** <https://forum.lulzbot.com/t/printing-from-sd-card-crashed-on-usb-connect/2626>\
**Category:** LulzBot TAZ\
**Created:** [December 15, 2015, 12:16pm UTC](https://forum.lulzbot.com/t/printing-from-sd-card-crashed-on-usb-connect/2626 "2015-12-15T12:16:01Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![\_Thomas](https://avatars.discourse-cdn.com/v4/letter/_/cab0a1/32.png) [@\_Thomas](https://forum.lulzbot.com/u/_Thomas)\
**Post date:** [December 15, 2015, 12:16pm UTC](https://forum.lulzbot.com/t/printing-from-sd-card-crashed-on-usb-connect/2626/1 "2015-12-15T12:16:01Z")

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When connecting the USB to any device without connecting a software the printer stops immediately its current print. The display still shows printing but the head just keeps at the latest position. I tried Pause and Resume already but no chance, the print is lost.

Is this a know issue? Is there a workaround?

Regards  
Thomas

TAZ5, Firmware 2015Q3

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**Author:** ![wmgeorge64](https://avatars.discourse-cdn.com/v4/letter/w/5fc32e/32.png) [@wmgeorge64](https://forum.lulzbot.com/u/wmgeorge64)\
**Post date:** [December 15, 2015, 12:36pm UTC](https://forum.lulzbot.com/t/printing-from-sd-card-crashed-on-usb-connect/2626/2 "2015-12-15T12:36:28Z")

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The SD card is in the machine correct? So why do you still have the USB cable connected?

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**Author:** ![\_Thomas](https://avatars.discourse-cdn.com/v4/letter/_/cab0a1/32.png) [@\_Thomas](https://forum.lulzbot.com/u/_Thomas)\
**Post date:** [December 15, 2015, 1:23pm UTC](https://forum.lulzbot.com/t/printing-from-sd-card-crashed-on-usb-connect/2626/3 "2015-12-15T13:23:38Z")

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> [@wmgeorge64](#):
>
> The SD card is in the machine correct? So why do you still have the USB cable connected?

Hi George, sometimes I make some small prints directly via USB or start long prints from SD-Card, however IMHO it does not matter for which purpose the USB connection is used, it is not very nice to have a system freezing just by unplug a USB cable. Right now for instance I make a long print, in the same time I wanted to check a Raspberry connected to it, but this I will certainly avoid for the time being.

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**Author:** ![Sebastian](https://avatars.discourse-cdn.com/v4/letter/s/4da419/32.png) [@Sebastian](https://forum.lulzbot.com/u/Sebastian)\
**Post date:** [December 15, 2015, 3:45pm UTC](https://forum.lulzbot.com/t/printing-from-sd-card-crashed-on-usb-connect/2626/4 "2015-12-15T15:45:56Z")

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Short version: Yes, it’s normal.  
Long version, see [here](https://ultimaker.com/en/community/6886-um2-controller-reset-reboot-when-opening-usb-port-on-linux).

Best thing to do is to get used to unplug USB before starting a SD-Print…