Problem with oval shapes.
June 02, 2017 02:52AM
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
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
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
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
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
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
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




Re: Problem with oval shapes.
June 04, 2017 05:12PM
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
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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