Problem with oval shapes. June 02, 2017 02:52AM Registered: 4 years ago Posts: 4
Hello.
My printer is similar to SparkCube but has some my modyfications.
I'v problem with oval shapes.

Rectangular shapes are ok.

Do you have any idea what might be wrong?
 Re: Problem with oval shapes. June 02, 2017 05:12AM Admin Registered: 11 years ago Posts: 2,569
Maybe a loose belt, or pulley ?

see [reprap.org]

Most of my technical comments should be correct, but is THIS one ?
Anyway, as a rule of thumb, always double check what people write.
 Re: Problem with oval shapes. June 02, 2017 09:10AM Registered: 5 years ago Posts: 45
In addition to checking the belts, etc. also make sure that the X & Y axis are perpendicular to each other. If they aren't you'll see similar issues. The X axis can be squared to the Y axis by adjusting the belt tensions.
 Re: Problem with oval shapes. June 02, 2017 10:39AM Registered: 7 years ago Posts: 251
Quote
tgmorris99
In addition to checking the belts, etc. also make sure that the X & Y axis are perpendicular to each other. If they aren't you'll see similar issues. The X axis can be squared to the Y axis by adjusting the belt tensions.

+1 for this.
 Re: Problem with oval shapes. June 02, 2017 01:40PM Registered: 9 years ago Posts: 5,671
How fast are you printing and how much acceleration?

Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
 Re: Problem with oval shapes. June 03, 2017 05:40AM Registered: 4 years ago Posts: 4
Thank you for the tips.
I adjusted the X and Y axes, set the belts, reduced the JERK to 5 and acceleration to 500.
I print with with speed: 20, 60, 80 and 100 .
Is better!
But problem is in four points on printed object:

Edited 1 time(s). Last edit at 06/03/2017 05:42AM by MagicMarcus.
 Re: Problem with oval shapes. June 03, 2017 07:19AM Registered: 9 years ago Posts: 5,671
Photos of the printer might help...

Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
 Re: Problem with oval shapes. June 04, 2017 03:27PM Registered: 4 years ago Posts: 4

 Re: Problem with oval shapes. June 04, 2017 05:12PM Registered: 7 years ago Posts: 601
Looks like belt is not parallel going to the hotend gantry..belt would get tighter at extremes of X axis and may explain ovals.

Also noticed you have twists in the belt which may cause the belts to ride on the pulleys flange sometimes

Edited 1 time(s). Last edit at 06/04/2017 05:14PM by Origamib.
 Re: Problem with oval shapes. June 05, 2017 01:53AM Registered: 4 years ago Posts: 4
I noticed that the bearing slightly moved in the housing.
When the direction changes, there is movement.

Maybe there is a problem here.
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