Simplify3D User Forum

I have two machines, a Lulzbotmini and a Printrbot Metal Plus and they both do the samething. What could it be?

I have messed with the Accel and Jerk on my Printrbot to try and resolve it but no luck.

It looks like it may be your retraction settings. Do your retractions occur in the corners occasionally? For example, go to the Layer tab and tell all retractions to be chosen "closest to a specific location". That will group all the start points together. Then does the issue only occur where those start point/retractions take place?

I had it setup for optimized start points. Just made the adjustment and doing a print.

Has this been solved? I am having the same problem, but I found that it does not occur with 0% infill or with Outline Direction: Outside-In.

No matter what the retraction or coasting setting (or any other setting for that matter) I still get rough corners.

Also, is there no way to force the layer change onto a flat surface of the perimeter instead of on a corner of a rectangular object?

This seems more indicative of something that would be solved with extruder pressure control (aka extruder advance). You can also solve it by increasing the jerk speed and decreasing the print speed. Coasting can help if it only occurs where you have retractions. Reducing retraction length may also help.

The root cause of this issue is that the extruder continues to ooze plastic after you stop extruding, even when you retract. You cant pull the molten plastic back, only reduce the pressure on it.

@layerone: I think Simplify3D only does start and stops at vertices, so not really. I noticed that when using the "Start at point closest to" option with a coarse sphere. The start/stop points followed the vertices of the sphere, rather than the exact point closest to the specified location.