Answered Bumps/Artifacts on Round 3D Printed Objects

Hi All,

I have an issue that perhaps you have solved/seen before, and might be able to help me fix it.

The Issue: Recently, every time I 3D printed an object that is round or cylindrical in shape, or has a big round edge, i.e. cylinders, balls, rings, box with big round corners, etc. then I am able to see some small bumps/artifacts in the cylindrical part of the object. This never happens with straight walls, or rectangular objects. See images attached.

Attempt to Solve it: At first I thought it was time to change the nozzle, so it was a great excuse to upgrade the R1 from the hexagon to an E3D V6 HotEnd and to finally get rid of the Z banding by also upgrading to 8T8 Lead Screws. As you'll see in one of the images(small boxes), the difference is black and white on Z banding. But this did nothing to stop the bumps/artifacts on round objects, other image.

Things that have been checked:

• Belts have been checked, and adjusted as needed
• Carriage sliding friction
• Bed sliding friction
• No obstructions to either the print carriage or bed

Other options to consider:

• New linear bearings, for both; Print carriage and bed
• New belts, for both; Print carriage and bed
• News Stepper Motors (all)
• New Driver board

Any help to fix this issue will be really appreciated.

 

Thank you for the pointer, Mark. I'll check these.