Print is jamming at the same point  

RE: Print is jamming at the same point

Hello again,

I've tried printing the bowl a third time and I got the same problem again at the same spot.

This time I used smaller layers at the problem area using 'variable layer height', so that wasn't the issue. But I've also monitored the print while it was doing it and took some pictures. The print seems really rough in these layers. My theory is the nozzle is like 'oozing' a bit and in subsequent layers the nozzle is pushing the excess filament outward, thus creating the ugly edges.

But after a few layers, the print then continues again normally. It's no doing this before or after these layers.

I really don't know what's causing this. I've downloaded the model (it's quite popular) and I haven't seen other people mention this problem. So I would appreciate some advice.

Here are the files again: Yarn_Bowl

You might do better with the Classic perimeter generator insead of Arachne (Advanced settings).

The variable layer heights are not helping, remove them.

Whilst snug supports are usually the best in this case I would switch to Organic supports and 'Support on the build plate only'.

And instead of gyroid I would use cubic fill.

Hth, Cheerio,

RE: Print is jamming at the same point

Thank you for helping. I'm gonna try Classic, Cubic and Organic supports. Maybe it will help

I don't think 'support on build plate only' is gonna work unfortunately. I found a few spots hanging in mid-air while inspecting. The supports can't reach there.

RE: Print is jamming at the same point

Agree with most of Diems points.  Except I'd still use snug but control it better by painting areas.  Also the support settings you are using are not optimal.  Not enough top interface layers etc.  Painting and selecting for enforcers only also gets rid of the pointless supports around the bottom of the bowl.

The problem area looks like what you get with too large an overhang and insufficient cooling.  As that area isnt really that much of an overhang then it could be not enough cooling.
One problem is the perennial extra solid infill added on sloping areas that we have been asking to be removed for years on the PS github.  Its adding extra material and heat that's just not needed.  That is possibly contributing to the not enough cooling in that area.  It can be limited by using a modifier and changing top/bottom layers to zero in just that area.

Something like in the attached project file.

RE: Print is jamming at the same point

Thank you very much for taking a look at it Neo! That's a lot of helpful information. You know if I can import the .config/.model you gave me or do I have to set them in the slicer?

Also good tips on supports. I was wondering about those bottom supports that didn't seem to do anything, but haven't got around to looking into it. As for the interface layers, I was having trouble removing supports from large overhangings, so I tried reducing them. It's still sticky though, so maybe that wasn't the issue.

I use an enclosure, with doors and top open. Ambient temperature was still about 30 C (it's summer here). Is that too much?

RE: Print is jamming at the same point

It’s just a PRUSA slicer project , just unzip and load. Was created in 2.8 though so you would need that version to open it I think.  You can then examine the painted areas etc. 

Interface layers can be a bit counter intuitive, making them thicker means they are more cohesive. That means they tend to come apart in larger chunks rather than breaking up and little bits getting stuck to the part. For larger areas you can often peel them apart in one go. I use 4 or even more layers as standard. 

Configs can be imported from projects, so you can import from an existing project into a new one if required, using the import config options. And of course once a set of settings are loaded/edited you can always save those as a custom profile if you intend to use them often. 

RE: Print is jamming at the same point

Thnx, I got it now. I didn't know the Slicer could import a complete zip file.

The model looks really great, I'm gonna try it out right away.

RE: Print is jamming at the same point

Hello, I thought I'd let you know how it went. I used the new settings with classic and I've also decreased the perimeter speed. You said too much heat could be the issue, so I figured slower speed could give it more time too cool. Did mean the print took 16h instead of 12h.

The result looks ok now. The messy lines are still there, but a lot less noticeable. Good enough to give it away as a present at least.

Also thanks a lot for fixing the supports. They came of very easily. I'm definitely gonna use those settings more often.