Yes. Pulleys are tight, bearings oiled etc. That was the same thing I was telling everybody else to check until I had a file in captivity that would consistently display the problem
I print lots of parts with no problems at all (well at least not this problem......)
Keep in mind that I can print this part very slow and it skews (no faster than 25 mm / sec for everything). I watched it print and no quick movements that I could see.
However I can print it with Kisslicer gcode quite fast (130 mm/sec rapids and 31 - 36 mm/sec printing) and it prints fine.
So here are what the parts look like.(I removed some of the support from the Kisslicer parts 3 and 4.)
Now I could go into a lot of details about each part, but I won't because...........
I think I found it.
I turned off retraction and the skew went away.
Now of course the part is full of strings.
I happened to be using ColorFabb PLA for these tests. The fellow that turned me on to this material said that it needed a high amount of retraction (3mm). That is quite a bit higher than I normally use, but the skew I was seeing was quite a bit more then I normally see too.
So the next test will be with retraction turned on but at a lower value to see if that results in less skewing.
Now, how I happened to try that was again by comparing the Kisslicer and S3D gocde files. Kisslicer has suck and prime settings and they were turned on (1.25mm) but I found no negative extrusion values in the gcode. So I don't know how Kisslicer is doing it.
So if this checks out, does it mean that it's a Leapfrog bug or an S3D bug???