Must be the slicer or the model, this part is rotated a good 120 degrees and the oddity is still there.
Did you check the model with netfabb?
I see you got the invisible blower fan option. Looks good 
Good news, Blower Fan is coming in this week. Bad News: It’s bringing four of it’s friends. Guess I have some more printers to make.
@Keith_Applegarth Nope, I can do that, though…I’ll also check out the g-code.
@Mike_Miller having spare fans is not a problem, having no spare when one inevitability fails is.
Did you look at the path in your slicer. That certainly looks like some odd mesh/slicer issue. What was it designed with or is it from thingyverse
I’m going to go with ‘both’. I would guess that this model was designed with certain assumptions that not all slicers follow. Someone that’s not aware of how different slicers work may have designed this. Slicers exhibit odd behaviors on models with thin walls because of assumptions they use to build the part.
A different slicer setting might change it, instead of two perimeters, try one, for example.
I know Cura over packs a wall if the wall is less than two nozzle widths wide. It’s not pretty.
In short, please post a link to the model if there is one to download.
The G-code looks okay in Cura (set to path display), I’ll run it through something else next.
Oh, and thingiverse: http://www.thingiverse.com/thing:14916
I’d be playing with your filament/extrusion settings as it seems you’re putting down just a little too much plastic. Might be worth simply adding 0.01-0.02 to the filament size to see if that helps.
As for your last post, you mentioned printing another part at 120 degrees - You’re printing a piece that has 3 arms separated at 120 degrees! In other words, it’s going to hit EXACTLY the same problem! You want 30 or 45 degrees rotation to see if it’s a problem. As mentioned above, I doubt it, but printing at 120 degrees isn’t going to tell you anything new.
Read the comments on that model, there were some issues on the perimeter sounds almost like what you are running into. He made a newer and improved version. Check out http://www.thingiverse.com/thing:15083
Which was supplanted by http://www.thingiverse.com/thing:16504 …which claims to be self starting. THAT is the one I’m trying next
Good luck. BTW love the look of your printer, nice job.
Yes, the model is bad. It has reversed triangles for one, two slicers warned of significant issues. It has inconsistent wall thickness and it lets the wall get too thin in several places. I haven’t looked at the improved version.
It’s odd. If it were the slicer I would think that it would happen to all 3 blades as it is more or less three of the same connected pieces 120 deg apart. I would do what others said and check in netfab if it didn’t get fixed by a rotation.
Checking it on my way to work, it looked like Mk6 was printing correctly…so…most likely a model issue.
I printet same model… it must be the slicer.
@Klaus_Schmidt It’s a known bad model, the author made a newer version. Some slicers are more tolerant of model problems than others.
@Jeff_DeMaagd
ok…