Help with oblong circles

I'm having problems with circles. I know they are always going to be slightly smaller in diameter than in the model due to a combination of factors, but whenever I print circles they end up oblong. They tend to be compressed along the y=-x axis. You can see that the infill is not connecting because it expects the perimeter to be out farther than it is. Any ideas what is causing this?
https://docs.google.com/file/d/0B0UR4sw1K9j9aC1zR1BvMS01cUk
https://docs.google.com/file/d/0B0UR4sw1K9j9cDFtUlNUY19IM2s
https://docs.google.com/file/d/0B0UR4sw1K9j9ajRqV0JoQVFZUUk

 

Check the set screw on your y axis pulley. Also low polygon models can turn out like that.

 

Its doing that on every model I've tried with circles in it, This was just a test print to illustrate it and for some measurements. I'll check the screw and try it again

 

After you check those screws, if you are still having problems, try going a bit warmer and a bit slower. I have seen circles get deposited shy of their dimension from wrong temps and layer adhesion, too.

 

I'll try but it seems weird that it would be wrong on a diagonal axis if it was the temps or the speed

 

I checked the set screws, they are fine, but the circles are still wrong. I'll try slowing it down and see if that helps, but I dont think it will from experience with past prints
https://docs.google.com/file/d/0B0UR4sw1K9j9WnBDclVfS0NIQlE

 

Are the set screws seated on the flat face of the drive shaft?

 

I had to double check these and found the bolts were loose and the set screws holding that gear were loose.

Tale off the bed to get a better go at it.

It made a difference to me. And I using the stock Robo with MC and Repetier using the stock settings recommended in the FAQ



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I'll check when I get back into work on monday. I had a brain fart when going to check the y pulley and checked the x pulley instead

 

I was also told to tighten the belt before checking the bolts and set screws. I tightened it a lot and it made a slight difference. I then took the advise to check those screws and sure enough they were loose. And the set screws were also loose. Once tightened, I was told to go back to the original tightness. So I would advise checking the screws first before tightening the belt.

It's such an easy fix and it surely beats having to upgrade any parts. Stock Robo prints amazing prints. Just have to make sure all those screws are tight,


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The set screws were fine, but the belt was loose. I tightened it and now its working a lot better. Thanks
https://docs.google.com/file/d/0B0UR4sw1K9j9YVBlZlFudG5IUk0