What could the problem be?

[GilmoreofOK]

Hey all, I have posted a few things in the last few months as to little things that have been occuring with my prints. 

Lots have folks have said the possibility of slacking, but I have replaced the belts now and they are still quite tight and I'm getting the same issues. I'm getting cateye effect on circles and having some intermittent top layer issues as seen here. 

So a few also mentioned the potential of a bent x rod. Could this be the toothed belt drive spindle going bad? could it be a bent rod? Anyone know??

[JF Kansas]

Not enough infill to support the layer so it is sagging. 

[GilmoreofOK]

I have ran infill at 10% and still getting this issue. I also get cateye-ing on every circle. EVERY, CIRCLE shape. Cat eyes...

[Rich Webb]

Square your X and Y axes?

[GilmoreofOK]

Pardon my ignorance Rich, whats Squaring the Axies?

[Rich Webb]

Ensure that the two are orthogonal -- at 90-deg to each other. If they aren't then rectangles become parallelograms and circles, ellipses. 

[Eric Pavey]

+1 to that:  You either need more top layers, more infill, or both.  Also, depending on your slicer, you can control how much overlap the roofs have with the perimeters:  Cranking that up (if possible) will let the extrusions "catch" on the walls better.  

This happens all the time to me:  More infill, more top layers.

Not sure what you mean by cateye, since I don't see any circles in your pic ;)

[Joseph Chiu (Toybuilder)]

Cat eyes is backlash.  The first thing to do is to figure out where the slop is coming from.  With the stepper motors locked (use jog mode),wiggle the carriage (and then the belts, one by one) and see if you get any play or wiggle to show up.  The flats of the cateye will tell you which axis is the problem axis (if the flats are separated in Y direction, then it's the Y axis, for example).

Make sure your extruder mount bar is screwed down tightly, too.  If it is loose, it could possibly wiggle similar to backlash.

[GilmoreofOK]

So looking at it and tryin got to pinpoint it, the heater assembly carriage; the bearings on the x rods the carriage sits atop of are spinning freely. The y axis bearings done spin freely at all. Is this possibly the problem? Bearings have possibly gone bad and are so loose it's causing the backlash?

[GilmoreofOK]

So I found a major issue a few weeks ago, the tension spindle had eaten through its plastic carriage. I replaced both ends of the x belt carriages and the belt is back to the best tension. So did an immediate test print with a circular base, STILL CAT EYES. None of the belts have slack on them, and I'm still getting the cat eyes. I have attached a photo of where the slacking still occurs, so it's hard to determine why I'm getting it. Any more advice? do I have a bent X Rod? The red marks is where the Cat Eye ridges are.