# Over extruded or humidity?

**URL:** <https://forum.lulzbot.com/t/over-extruded-or-humidity/4089>\
**Category:** Filament\
**Created:** [October 10, 2016, 10:56am UTC](https://forum.lulzbot.com/t/over-extruded-or-humidity/4089 "2016-10-10T10:56:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![mrmatt68](https://avatars.discourse-cdn.com/v4/letter/m/e47c2d/32.png) [@mrmatt68](https://forum.lulzbot.com/u/mrmatt68)\
**Post date:** [October 10, 2016, 10:56am UTC](https://forum.lulzbot.com/t/over-extruded-or-humidity/4089/1 "2016-10-10T10:56:00Z")

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I recently purchased a TAZ 6 and have gotten decent results for not tweaking anything but i consistently get `bumbs` in my prints and hear popping sounds while extruding. I am using ABS from Matter Hackers and am not sure if it’s the material or machine. I have built a `hotbox` to limit airflow from the outside but it isn’t heated from another source…only the printer. I am using the latest version of Cura and sliced with the fast profile and zero percent infill. Here is a pic of the latest part showing the `bumbs`. Is this something i am doing or Material?

Thanks,

Matt

 ![IMG_0016.JPG](https://us1.discourse-cdn.com/flex020/uploads/lulzbot/original/2X/c/c32bbf5acbab7d2f53d14f071548559b0c0d2847.jpeg)

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**Author:** ![piercet](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/piercet/32/12_2.png) [@piercet](https://forum.lulzbot.com/u/piercet)\
**Post date:** [October 10, 2016, 2:20pm UTC](https://forum.lulzbot.com/t/over-extruded-or-humidity/4089/2 "2016-10-10T14:20:59Z")

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Those bumps are starting points of the layers. You can minimize that by setting your machine to do internal perimiters first. There may also be a “start layers on corners or inside curves” button, I’m not sure since I don’t use Cura. The popping sound can either be humidity, retraction, or just the clicking sound plastic makes coming off the spool sometimes as it shifts against the other windings. Typically a humidity blemish looks more like a popped crater.

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**Author:** ![mrmatt68](https://avatars.discourse-cdn.com/v4/letter/m/e47c2d/32.png) [@mrmatt68](https://forum.lulzbot.com/u/mrmatt68)\
**Post date:** [October 10, 2016, 7:18pm UTC](https://forum.lulzbot.com/t/over-extruded-or-humidity/4089/3 "2016-10-10T19:18:07Z")

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Thank you

I am currently setting up Slic3r with the profiles listed on this site and want to try that. I have seen some settings like you describe in it.

Will report back when new part comes off machine.

Matt