# extruder jams on larger prints and other problems

**URL:** <https://forum.lulzbot.com/t/extruder-jams-on-larger-prints-and-other-problems/238>\
**Category:** LulzBot TAZ\
**Created:** [August 6, 2013, 9:43pm UTC](https://forum.lulzbot.com/t/extruder-jams-on-larger-prints-and-other-problems/238 "2013-08-06T21:43:57Z")\
**Posts on this page:** 1\
**Showing post:** 22

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**Author:** ![ray](https://avatars.discourse-cdn.com/v4/letter/r/e9a140/32.png) [@ray](https://forum.lulzbot.com/u/ray)\
**Post date:** [September 25, 2014, 6:02pm UTC](https://forum.lulzbot.com/t/extruder-jams-on-larger-prints-and-other-problems/238/22 "2014-09-25T18:02:20Z")

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> [@scott](#):
>
> -I’m printing pla on bare glass cleaned with rubbing alcohol and set to 60c. When I print towards the edges I get medium to poor adhesion; guessing this is due to inconsistent heat bed.

Some [users](https://forum.lulzbot.com/t/glass-bed-delamination-and-glass-replacement/843/4) have encountered flaking or delamination when removing parts when printing on bare glass. We recommend printing with either the stock PET surface, or with the new PEI print surface that some of our more advanced users are [using with great success](https://forum.lulzbot.com/t/pei-bed-surface/690/1).

Thanks!

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