# z issues

**URL:** <https://forum.lulzbot.com/t/z-issues/3907>\
**Category:** LulzBot TAZ\
**Created:** [August 26, 2016, 3:30am UTC](https://forum.lulzbot.com/t/z-issues/3907 "2016-08-26T03:30:58Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![CJay](https://avatars.discourse-cdn.com/v4/letter/c/e68b1a/32.png) [@CJay](https://forum.lulzbot.com/u/CJay)\
**Post date:** [August 26, 2016, 3:30am UTC](https://forum.lulzbot.com/t/z-issues/3907/1 "2016-08-26T03:30:58Z")

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Hey all. Just started doing some smaller items and noticed this issue in the pic. The layers are reasonable good and part is solid as a rock however the layers seem to be off in diameter slightly from one another and as best I can tell they are not in an oscillating pattern. I’m using a taz 6 and have unconstrained the top of the lead screws by removing the bearings. Printed a 3d beachy to confirm success and the z banding I had been getting all but disappeared now however on smaller diameter items this is happening…bit stumped lol  
 ![tmp_14712-20160825_232203-1607590793.jpg](https://us1.discourse-cdn.com/flex020/uploads/lulzbot/original/2X/f/f6de5df081d6605012f602d0d5dd783add1a3c5a.jpeg)