PrusaSlicer leaving large gaps in support towers
 

[Solved] PrusaSlicer leaving large gaps in support towers  

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JP Powers
(@jp-powers)
Eminent Member

I've recently started working on adding my FLSun QQ-S (a delta printer) to my setup for PrusaSlicer 2, and while the basics are seemingly all setup and without issue I'm clearly missing some key component once I start enabling supports on the types of models that need it.

I've tried this with support enforcers, everywhere, and build plate only with a few different models now and all have the same problem. While slicing I can see tool paths where I'd expect to see the supports, but once it completes there are gigantic gaps. The first layer is almost always there, and the interface layers under the actual model, but it's a total crap shoot on if there will be any other support material.

While slicing:

Once complete:

The most complete I've seen it is with supports everywhere but it's supporting things unnecessarily and there's still a big stripe in the missing supports.

Supports everywhere:

I'm attaching the 3MF of my slice as pictured with support enforcers only in case anyone's interested in taking a look, but I can't figure out what I've got setup "wrong." I've seen this problem with multiple models so I'm fairly certain it's not as simple as a poor geometry or something with specific models. I have exported the gcode anyways so I could load it up in a gcode viewer and those tool paths are definitely missing. I can't quite explain what would do this and I am thinking it's a bug but I want to confirm it's not just some stray odd setting first.

Best Answer by --:

You have some sort of configuration issue - the 3mf is crashing when I try to slice with your settings.  Slicing with my settings is working fine.  There is a known bug importing odd Slic3r PE profiles into Plicer - so you may be running into that defect when you imported your specific printer details.  For reference, it's crashing when rendering the slice.

I agree enforcers are working better for this part, but I haven't done a serious inspection around the ears and other areas there are likely perimeter overhangs.

Your originally posted images are lacking sufficient detail to show the issue you are fighting. I still have no clear idea, other than the general concept you don't think supports are working.  And based on the fact supports using stock profiles works as expected, and trying to use your custom profiles fails, I'd say that is what you're fighting.

You should look at how you created the delta and other profiles. Perhaps start from scratch only using Plicer and not using imported sources.  Creating new printer profiles isn't something I've done, so not much help there. 

And, after spending some time looking at your settings, I tweaked your layer range from 0.03/2.5 to 0.05/0.30 and got Plicer to slice and render.  You might try changing those values on your end to see if it affects your slice.

 

jp-powers.com...
Posted : 01/07/2019 4:04 am
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(@-2)
Illustrious Member

Your images aren't useful.  You need to post them here with the LINK TO MEDIA FILE option set.

And that part has no need for support enforcers, why are you trying to use them?

ps: and your 3mf also didn't make it.   ZIP the STL and drag the ZIP into the text box ... same for your images, and with the images make sure you select LINK TO : MEDIA FILE.

 

This post was modified 2 years ago by --
It is always wise to get more than one opinion... as for trusting Prusa? No way man....
Posted : 01/07/2019 9:16 am
JP Powers
(@jp-powers)
Eminent Member
Posted by: Tim

Your images aren't useful.  You need to post them here with the LINK TO MEDIA FILE option set.

And that part has no need for support enforcers, why are you trying to use them?

ps: and your 3mf also didn't make it.   ZIP the STL and drag the ZIP into the text box ... same for your images, and with the images make sure you select LINK TO : MEDIA FILE.

 

Images aren't useful: ... if you can ask the following question, how are they not useful? If you can see the model to comment on needing support enforcers or not, you can see that the first image (where the model is shown with yellow perimeter lines) there is a "plan" for the supports, then when it's complete (and the perimeters change to orange) they disappear. Either way, instead of linking to the imgur uploads I'll add them directly.

Not needing support enforcers: Are you saying it doesn't need supports, or enforcers specifically? The chin definitely needs supports. The lower tip of the chin will be printing in mid air otherwise. It could recover eventually, but I really don't mind "wasting" plastic on supports to get a better quality print for something that's a desk piece anyways. Something more functional, sure, whatever, skip supports, but if the point is making a pretty print I want it to be as pretty as possible. Also, the back of the mohawk might not need it but as this is a new profile for a completely different printer than the Prusa I thought it would be a good idea. If, however, you're thinking I should change the orientation, then it will only require even more support material. I tried shifting it around a good bit and the angles I tried would just require even more. If you're saying no need for support enforcers specifically? When I sliced it with supports only on the bed or everywhere it generated way more supports than is truly needed. I don't know why I wouldn't use enforcers if I feel some support is needed?

3MF not attaching: Thanks for pointing that out. I definitely used the "attach file" under the text field, it was listed, but yeah, I also don't see it. That said, zipping the STL would not help, it would just be reuploading the STL. The 3MF includes the exact slicing settings I have, the goal of sharing it being that another user could look at them and help troubleshoot the problem.

skull2

jp-powers.com...
Posted : 02/07/2019 6:31 am
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(@-2)
Illustrious Member

You have some sort of configuration issue - the 3mf is crashing when I try to slice with your settings.  Slicing with my settings is working fine.  There is a known bug importing odd Slic3r PE profiles into Plicer - so you may be running into that defect when you imported your specific printer details.  For reference, it's crashing when rendering the slice.

I agree enforcers are working better for this part, but I haven't done a serious inspection around the ears and other areas there are likely perimeter overhangs.

Your originally posted images are lacking sufficient detail to show the issue you are fighting. I still have no clear idea, other than the general concept you don't think supports are working.  And based on the fact supports using stock profiles works as expected, and trying to use your custom profiles fails, I'd say that is what you're fighting.

You should look at how you created the delta and other profiles. Perhaps start from scratch only using Plicer and not using imported sources.  Creating new printer profiles isn't something I've done, so not much help there. 

And, after spending some time looking at your settings, I tweaked your layer range from 0.03/2.5 to 0.05/0.30 and got Plicer to slice and render.  You might try changing those values on your end to see if it affects your slice.

 

This post was modified 2 years ago by --
It is always wise to get more than one opinion... as for trusting Prusa? No way man....
Posted : 02/07/2019 9:31 am
Neophyl
(@neophyl)
Noble Member

I also tried slicing your 3mf file and it crashed on my pc too (win 7 64 bit).  Like Tim I changed the printer profile to my cr10s profile leaving the filament and print settings alone and after that it sliced fine for me. 

Posted : 02/07/2019 4:24 pm
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(@-2)
Illustrious Member

As stated in my post above, I'm pretty sure Plicer is freaking out on the Printer Profile layer range: 0.03 to 2.5 mm is a bit wide for a 0.4 mm nozzle.  I've seen evidence Plicer uses variable layer heights printing supports, and it may be using 2.5 mm in places, then having issues rendering correctly.  It's probably a typo and that 2.5 should be 0.25. 

In any event, Plicer should throw a warning, not crash.

 

It is always wise to get more than one opinion... as for trusting Prusa? No way man....
Posted : 02/07/2019 6:26 pm
JP Powers
(@jp-powers)
Eminent Member

Is it a crash to desktop, no errors, no logs? That's definitely interesting. I'm using PrusaSlicer 2.0 on Linux Mint, and it runs and completes the slice without fatal issue, just not slicing how I'd expect.

I'm at work so I can't confirm this at the moment, but I have a couple thoughts:

1. I've got a USB 3.1 external ssd with Windows to Go on it for my laptop (the one I usually use with Linux Mint). I'll install PrusaSlicer on that Windows install and see if I can recreate the crash. Mostly so I can submit a bug.

2. I'll confirm that layer range item. I'm not sure if the 3mf isn't exporting my setting properly or if it is an error on my part (like I said, not at the system so can't confirm). Pretty likely a typo, though, and I agree that sounds like a quite likely issue for the supports not functioning.

jp-powers.com...
Posted : 02/07/2019 6:40 pm
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(@-2)
Illustrious Member

ps:

Printer Settings : Layer Height Limit setting causes crash#2589

It is always wise to get more than one opinion... as for trusting Prusa? No way man....
Posted : 02/07/2019 6:56 pm
JP Powers
(@jp-powers)
Eminent Member

Quick follow up: YUP, there was a typo on the layer height limit max. Moved the decimal, and supports are there.

@tim-m30, as you mentioned, you've seen evidence of variable layer heights for supports. I'm guessing where the supports were missing it was attempting to do 2.5mm layers, something decided "whoa that's DUMB dude," and just didn't do it. The few layers I did see supports must have been in some "good enough" range. I'm guessing there's a really good chance that the reason it crashed for you guys, but not me, is some fundamental difference between how things are working in the backend on Linux versus Windows.

Thanks the assistance, guys. I knew there was some mistake in my settings and I probably wouldn't have caught that without completely recreating it.

jp-powers.com...
Posted : 03/07/2019 3:28 am
BillC liked
AbeFM
(@abefm)
Reputable Member

Glad that all worked out, I've precious little to add except to wonder if the layers aren't being skipped... They just aren't putting out the full 2.5 mm of material - perhaps the very top/bottom support layer on a gap is a "thick" line, but not in reality.

I maintain an informal list of San Diego, CA 3D printing enthusiasts. PM me for details. If you include a contact email and I can add you to the informal mailing list....
Posted : 11/07/2019 7:46 pm
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(@-2)
Illustrious Member
Posted by: abraham.m

Glad that all worked out, I've precious little to add except to wonder if the layers aren't being skipped... They just aren't putting out the full 2.5 mm of material - perhaps the very top/bottom support layer on a gap is a "thick" line, but not in reality.

A 0.4 nozzle can't really produce a 2.5 mm layer.  And there is a defect in the code that doesn't flag the error; it tries to render and fails with a math error - check the link to the issue post.

It is always wise to get more than one opinion... as for trusting Prusa? No way man....
Posted : 11/07/2019 10:21 pm
AbeFM
(@abefm)
Reputable Member
Posted by: Tim it tries to render and fails with a math error - check the link to the issue post.

Heh, I skimmed it, and forgot it. So much for my solving the world's problems.

I maintain an informal list of San Diego, CA 3D printing enthusiasts. PM me for details. If you include a contact email and I can add you to the informal mailing list....
Posted : 11/07/2019 10:34 pm
george.y
(@george-y)
New Member

can we get tree supports in a future release of prusa slicer id really like to see that

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Posted : 12/07/2019 8:45 am
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