Print at an angle

Hi,

I have corexy system:



But I have some problems.

I get prints at an angle as you can see on below pictures:



I don't know why? Please help me how can I resolve this problem.

Can it be that one of the two pulleys on the motors is slipping on the motor?

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http://www.marinusdebeer.nl/

For me the problem is simplier.
Sorry to say that to you but your belt path is wrong.

The blue belt path is not perpendicular to the red belt path, and all red belt path are not parallele. So at each movement you constrain your belt lenght to "cos alpha", and so you "modify" the absolute coordonate at each layer.



Regards

Zelogik thank you for your answer. I will repair that. And how is with outer belt (left and right) which you didn't mark it. It have to be parallel too?

No it's only an aesthetics problem for the outside belt. So not really important for your problem :-)

It seem to me that poldek have tightening problem in one belt, meaning that backlash exist. Perpendicularity of the belts should not be important (it is symmetrical for first and second belt).
Different tightening (meaning small difference in length) have ending effect that motor from more tighten side could "still" the steps...

More to the point, the belt paths between a fixed point and a carriage must be exactly parallel to the carriage motion. So yes, this means that the red and blue belts as indicated will be perpendicular, but it's more important that the belts are parallel to the direction of motion that they're actuating.

If parallelism is not achieved then belt tension will change as the carriage moves; it should be obvious why that is bad if you think about it for a second.

Belts between two fixed points can be in any old direction, because the relationship between those points does not change.