Simplify3D User Forum

So far I have been all over the process tabs, and I see nothing to prevent the nozzle from crossing perimeters. I have a 13x4x4" thin wall model that I print using a bowden setup, and I just can not stop from getting some sort of nozzle dribble coming out of the surface that I need flawless. I also notice the nozzle traveling way too far instead of completing a local area at a time.
Am I missing something?

I am an S3d user and have emailed support about this same problem, without any remedy given. It is a big problem, especially with ooze prone materials like ninja flex. It is a very inefficient use of travel moves. I have recently researched Slic3r and it has a setting called "avoid crossing perimeters" that is supposed to help with this. I have not had a chance to try it yet. If S3D had a setting that would keep the nozzle inside the perimeter, basically "coasting" until it gets to its new start point on the same part, it would be a huge help. However, with more than one part in the build, movements from part to part makes crossing the perimeters unavoidable. It would help if you could specify that it moves from part to part at the same spot instead of jumping all over the place at random. I am with you on this ssue that it needs to be improved. In the meantime, printing one part at a time helps

Try printing in sequential print mode. It will stop alot of that jumpng around and speed things up. Also be sure you have the start points set to optimized.

Thank you for the tips, I totally appreciate them. Though, I have tried Sequential, layer by layer, islands, starting from a preferred point. So many ways, but resulting the same. I try to print 2 at a time to keep up with demand. Otherwise its, wait to cool, pull part off, recoate surface, warmup, ....etc we all know the routine.
The software is great, but this has to be addressed a bit better, even if the head needs to travel wayyyyy around to hit the next start point. If I add another 15 minutes to travel speed, so be it. I already wait 16 hrs for these to finish.

Well I sure hope the result isn't the same when you change all of those settings! About 90% of the travel movements I can see in your image would all go away if you properly configured sequential printing (read more here: https://www.simplify3d.com/support/tuto ... -printing/)

Its one thing to have multiple parts that you can use sequential printing to help, but I doubt 90% can be removed. In the case below, this is a single part that I forwarded to S3D for help, but the only offer was to use coasting, wipe, and retraction to minimize ooze. That does not work well with ninja flex. The real problem is too many inefficient moves. It seems that the movements would be more efficient if they stayed within the boundary of each layer and avoided rapid moves. For example, once a layer is completed, move up in Z, and begin the next layer at that point without rapid moves. I've tried start points, but it does not minimize the rapid moves. If you use optimized start points, then your surface finish suffers. You could get near perfect part finish with ooze prone materials if the software had a setting that minimized rapid moves and kept the extruder tip within each layer boundary as much as it can. Much like cnc 3 axis tool paths staying within the boundary of a pocket at each depth. To get acceptable surface finish (but it could have been much better) on this ninja flex part for my customer, the only option was to use a single width skirt the height of the part to help catch the stringing as much as possible. Downside is increased build time and material usage.

JoeJ wrote:Well I sure hope the result isn't the same when you change all of those settings! About 90% of the travel movements I can see in your image would all go away if you properly configured sequential printing (read more here: https://www.simplify3d.com/support/tuto ... -printing/)

The result is the same, every single time. I have more issue with 2.2.2 than 2.2.1. I had already contacted support on a few issues. I was told the engineering team will look into it. I have changed retraction length and speed, and had it dialed perfect. I have recal'ed, I've done so many things to reduce the adverse affects of this that I am just waiting until the next version to hopeful answer this issue.
The same perimeter issue even with a single model.

This feature was added in version 3.0. Just click "Edit Process Settings", go to the Advanced tab, and enable the "avoid crossing outlines for travel movements" option. This will divert the travel paths to try to avoid crossing your outline perimeters. You can even set the maximum detour factor (for example, only allow these detour movements if the final movement is less than 3x as long as the original straight-line movement).