Diagonal model with support  

RE: Diagonal model with support

Could you try uploading the screenshot with higher resolution? It is quite hard to see anything. Information about your slicer settings would be interesting, too.

RE: Diagonal model with support

Sorry, didn't notice the medialibrary automatically resizes images when adding them to the post (newbie here).

Default prusa settings except for enabling "Generate support material" and "Detect bridging perimeters"

Placed model (Space 1999 Eagle from thingiverse see below) at a 35° angle to maximize the print area. A lot of support is needed because the Eagle rests on a number of feet. I know this is not the best way of printing this, but I'm still learning the functionalities of the slicer before I'm trying to print my own models. Massive amounts of unneeded support is added in the lower right and the upper left corner.

RE: Diagonal model with support

You need to save your build plate and settings as a .3mf project and then zip it up and attach it here.  We can then look for what might be the issue.  

For example are you using a raft ?  Is there some issue with the model ?  Does the angle make a difference ?  Going through a huge list of possible issues is impractical.  With the project we can examine all the settings quickly and (hopefully) give some useful feedback 🙂

Brave printing an eagle all as one part like that given the framework.  Id imagine thats going to make support removal a nightmare to start with.  btw on that subject make sure you change the z contact distance for support from the default of 0.1 to 0.2 or 0.25 otherwise it will stick too well.

RE: Diagonal model with support

Zip file containing .3mf project with diagonal model.
Also included a .jpg of the same model printed (shrunk to fit horizontally).
Here the support material follows the outlines of the model.

Eagle

PS: I have no intention to actually print this model (there are larger models broken up in peaces who will print nicely).
Just wanted to learn Prusaslicer (place models, enlarge, cut, slice with and without support, how does support look like in print, is it difficult to remove, ...)

Thanks in advance !

RE: Diagonal model with support

I second the need for the .3mf file (@yveske, this file will include for us your settings, the actual model, and the model's placement on your print bed). I see other issues, like the supports on top of the landing leg pods towards the back of the bed. So either there is a settings issue or the model has issues that Plicer hasn't noticed (no exclamation mark next to the model name in the object name list).

EDIT: Oops. You did post the .3mf file while I was typing in the above. Please ignore the man behind the curtain. 😉

RE: Diagonal model with support

I've recently been noticing the same issue, but for me I've found it happens when I change the pattern angle of the supports, not just if I rotate the model.  It's something involving the relationship between the support direction and the model's primary axis?

Here's a .3mf file for a model, and screenshots showing the supports when set to a pattern angle of 0 or 45.  

Truck2

Support Pattern Angle 45

Support Pattern Angle 0

RE: Diagonal model with support

I can tell you now that model will not print without extensive work.

It is made up of 721 parts, some are manifold most are not.  Also most parts are not connected to each other.  Basically it might be useful for rendering a scene but it was not designed with 3d printing in mind.  There's parts missing from the Eagle too.  Its going to have supports trapped inside, outside basically everywhere.  From a 3d print perspective its a mess.

I examined it in Blender and also 3D Tool but if you choose Split to parts in Slicer you will see all the parts listed in the files window (dont split to objects as that will place them all individually on the Plater).  Once Split you will see all the parts with issues.

Even if you were to repair all the issues on the individual parts the fact they arent connected to each other still means it wouldnt print correctly to give you a nice Eagle model.

Sorry missed the bit where you said you werent going to print this.  Id practice first on a model that is designed with 3d printing in mind.

RE: Diagonal model with support

@neophyl. I'm fully aware this model is not intended to print, I just used it to play around in Prusaslicer (first day total newbie in 3d printing).
I'm just wanting to know what to do if I encounter it with my own models.
And apparently I'm not the only one who has this problem (see lindharin above).

RE: Diagonal model with support

Posted by: Neophyl

I can tell you now that model will not print without extensive work.

It is made up of 721 parts, some are manifold most are not.  Also most parts are not connected to each other.  Basically it might be useful for rendering a scene but it was not designed with 3d printing in mind. 

Hi Neophyl,

I think your first comment here was for the truck model?  If so, I totally agree the model is a mess for 3d printing.  A friend requested it, so I've actually taken the time to modify it to be printable.  It was a good learning experience for me.  The reason I used the original file for my post was just because I'd worked on it last week so I'd seen the weird supports on 45 degree pattern angles recently, so I could find it and demonstrate it quickly. 

I have gotten the same weird and oversized support structures with other models that I set to 45 pattern angle though.  I just don't recall which ones, so I'd have to try to find them.  Maybe they were all models that were poorly designed for printing, I don't remember.  

RE: Diagonal model with support

My original comments were all related to the eagle as I hadnt seen the post with the truck in before i posted.  Both models though are a nightmare print wise 🙂  parts not connected to each other etc.  I think the models are giving PrusaSlicer algorithms a fit.

I've attached a zip with a part in.  The part isnt even that good as its also made up of several  discrete parts rather than a single manifold part but it does slice and print properly as Ive printed it in the past.  The support angle can be changed and it doesn't exhibit the same issues as the Eagle or truck.  The part was rotated by 45 degrees to fit on the bed and I have tried support angles of 45, 30 and 0 degrees.

RE: Diagonal model with support

I like these views ... before, then after repairs ...

RE: Diagonal model with support

Odd, due to the chamfer at the bottom I would have expected support all along the underside.
Your piece doesn't exhibit the excessive support though...

RE: Diagonal model with support

I'm pretty sure there are unattached vectors that have vertices at the part origin, and slice is trying to recognize them. Both the Eagle and the Truck.  But the truck has a lot of improperly formed surface planes.  Filling everything to ensure all the parts become normals seems to help. But the process can lose detail.

Printing such a part, things like the rear bumper will cause all sorts of problems: supports will adhere and it will tear off when removing the support. As will many other under carriage bits.  Then there's the hollow cab ... bridging just is not going to work well with it. 

But here's the truck in a semi-printable form.

Truck_Solid

RE: Diagonal model with support

You can control what overhang percentage angle triggers the auto support, that chamfer angle is well within the printable angle so no need for support.  I just used your auto generated defaults.  On the parts I actually printed I blocked supports on the side details as even though its technically a overhang in practice it prints fine.  I also blocked support in the tube areas as its not needed there and is difficult to remove it all.   Basically that Las Pistol upper will print with supports only below the bottom middle.  You dont need any anywhere else really.

What I was trying to illustrate is that the excessive support is far more likely to be caused by the model than by the angle of the part or angle of the support.

RE: Diagonal model with support

Thanks all ! Learned a lot, but still have heaps to learn apparently...

RE: Diagonal model with support

Here's the boat with support limited to 15 degrees (aka 75 degrees) and the letters removed from the stern.

RE: Diagonal model with support

And here's what can be done using supports and modifiers ... the idea here was I only wanted supports under the fins and one extreme overhang along the bode, and of course around the mouth so the teeth and victim are well formed.  But there are suppressors too, so that excessive support inside the mouth is avoided.

RE: Diagonal model with support

Guess it does look like a boat at that angle 🙂  Its the upper part of this -

RE: Diagonal model with support

Ah - that side of the tracks ...