size differences depending on XY orientation of object

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neep
Posts: 19
Joined: Sun Jan 04, 2015 12:45 pm

size differences depending on XY orientation of object

Post by neep » Sat Oct 22, 2016 12:47 pm

I'm having some very peculiar issue with my Felix 3.1 printer.

I am printing an object and then a mirrored version of that object. The object should be the exact same size, but it
is not, for some reason. This is how I am printing them:
Screen Shot 2016-10-22 at 13.41.21.png
Screen Shot 2016-10-22 at 13.41.30.png
When I overlay the 2 objects printed, I get:
difference.jpg
As you can see there is a difference. When I try other angles, one is always larger than the other, or has a different curvature.

When I rotate the objects to have roughly the same Z rotation on the curved side, this seems to get better. For example:
Screen Shot 2016-10-22 at 13.36.41.png
Why is this? What is going on with the printed that can cause this? Do I need to calibrate the XY steppers somehow? When I print squares, they have 90 degree angles, so I don't understand at all what is happening. When I do not mirror the object but print it at different areas of the platform, they always match perfectly. Why is it that for a mirrored version of this object it is so hard to get the exact same dimensions on this printer?

Any ideas?

neep

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gfeliksdal
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Posts: 400
Joined: Sat Feb 25, 2012 10:40 pm
Location: Netherlands
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Post by gfeliksdal » Sat Oct 22, 2016 11:57 pm

Hi Neep,

This normally appens when:
- the x and y-axis are not 100% perpendicular to eachother.
- when the belts are not pretensioned properly or defect
- one of the setscrews is loose (of the pulley on the motors)
- Belt is worn. most likely y-axis.

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