# 30 hours into print cura throws error

**URL:** <https://forum.lulzbot.com/t/30-hours-into-print-cura-throws-error/4286>\
**Category:** Software\
**Created:** [December 4, 2016, 3:22pm UTC](https://forum.lulzbot.com/t/30-hours-into-print-cura-throws-error/4286 "2016-12-04T15:22:09Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![myeager](https://avatars.discourse-cdn.com/v4/letter/m/f08c70/32.png) [@myeager](https://forum.lulzbot.com/u/myeager)\
**Post date:** [December 4, 2016, 3:22pm UTC](https://forum.lulzbot.com/t/30-hours-into-print-cura-throws-error/4286/1 "2016-12-04T15:22:09Z")

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30 hours into a 33 hour print, cura throws an error, printing stops, print ruined. Error says an error was encountered and pythonw.exe has to close… Any thoughts on ways to prevent this from happening in the future? Not sure whether to start the print over or not, may fail again after 30 hours… Is Simplify3D a more reliable way to go? Is there something else that can be done?

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**Author:** ![myeager](https://avatars.discourse-cdn.com/v4/letter/m/f08c70/32.png) [@myeager](https://forum.lulzbot.com/u/myeager)\
**Post date:** [December 4, 2016, 10:23pm UTC](https://forum.lulzbot.com/t/30-hours-into-print-cura-throws-error/4286/2 "2016-12-04T22:23:11Z")

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Is printing off the SD card more reliable than printing from Cura over USB?

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**Author:** ![myeager](https://avatars.discourse-cdn.com/v4/letter/m/f08c70/32.png) [@myeager](https://forum.lulzbot.com/u/myeager)\
**Post date:** [December 4, 2016, 10:37pm UTC](https://forum.lulzbot.com/t/30-hours-into-print-cura-throws-error/4286/3 "2016-12-04T22:37:52Z")

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I think I know why it failed. Security update installed automatically on the PC. Not Cura’s fault.

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**Author:** ![Brent.I](https://avatars.discourse-cdn.com/v4/letter/b/ecc23a/32.png) [@Brent.I](https://forum.lulzbot.com/u/Brent.I)\
**Post date:** [December 5, 2016, 2:33pm UTC](https://forum.lulzbot.com/t/30-hours-into-print-cura-throws-error/4286/4 "2016-12-05T14:33:48Z")

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Printing from SD will remove possible computer errors like updates, power settings, sleep settings, etc. Glad you are able to get it sorted!