3D Printing Tech Tips: Blobs and Zits in your Filament

Here at 3D Platform (3DP) we take pride in our open-market solutions. Our Print Processing Tech Tips series focuses on best practices for processing procedures so you’re guaranteed the perfect print every time.

Today, we’re focusing on blobs and zits.


All materials are susceptible to blobs and zits, which causes the surface finish to not look good. Blob and zits can happen for a lot of reasons:


Failed Print: The print has several blobs and zits on the outside of the print, lowering the quality of the completed part.

Retraction settings are not set correctly. These settings should be adjusted to avoid over-extrusion at a starting or stopping point of the extruder.

The retraction distance can cause a bad print if set up at .10 mm.

If you use random start points for all perimeters, you can bet that you’ll end up with a bad print.


Proper settings are essential for smooth layers. Try these out for a smoother finish:

  1. Set your retraction distance at 1.10 mm.
  2. Choose a start point closest to a specific location.

Fixed Print: Proper settings are essential for smooth layers. There are no blobs or zits on the completed part.

For more helpful hints on how to prevent blobs and zits, check out the full case study.

What are some of your best practices for blobs and zits? We want to know. Share them with us on Twitter #3DPPrintingTips, or send them to

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