Strange Tool path irregularity

[Cordvision]

I just sliced a part that has gear teeth. Each tooth is exactly the same. For some reason, kisslicer creates blobs on the tips of a few teeth. I decided to take a closer look at the tool path in kisslicer, and I can actually see where the "mistake" happens. As you can see in the attached screenshots, a few of the teeth have some "extra" tool path on the very tip. This creates a blob of extruded plastic where there shouldn't be any (outside the actual model boundary). Out of over 100 teeth on the part, about 7 have those blobs, the other ones are fine. Any idea what might cause this? 

BTW: Using the lates Kisslicer Beta version.

[PenskeGuy]

Might be good to take a look at the model. I'm unsure why the path is sharp, while the teeth appear to be a normal spur gear shape.

Does altering OverSample Resolution change them?
How about Crowning length?

[Cordvision]

Thanks for your help. I just set crowning length to -1 (disabled it) and it fixed the issue. Not sure if that is a bug within crowning or if this is just how it works. I noticed that the paths for each tooth are a little bit different from one another, but it is such a small gear (mod .8) that I think this might just be some sort of rounding error. I think the path ends in a point because the diameter of the extruded plastic (looked at from the top) is larger or equal to the tip size of a tooth. 

[PenskeGuy]

Crowning shouldn't exceed the extremities of the part, so there may be an issue here that is worth investigating. Yes, rounding errors have been problematical in earlier versions; especially on acute angles of exterior corners. Usually, setting a finer OverSample Resolution will cure them.

[Bart]

Recently the crowning was erratic because of a negative inset.  It's a sensitive ruler....

Op 29 sep. 2014 10:48 schreef "PenskeGuy" <bj-g...@imperialearth.com>:

Crowning shouldn't exceed the extremities of the part, so there may be an issue here that is worth investigating. Yes, rounding errors have been problematical in earlier versions; especially on acute angles of exterior corners. Usually, setting a finer OverSample Resolution will cure them.

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[Cordvision]

I had it at the default value (I believe that was 1) when it caused the problem.

[funBart]

Ah, no, I meant really inset on the Style-Tab, not the Crowning threshold. With a earlier beta, and Crowning enabled, and a negative inset on the style-tab it was giving odd results, but that's fixed now.