Filleted edges problem - settings?  

Re: Filleted edges problem - settings?

I'd lean toward this being poor code generated by Slic3r. On my parts I typically put a 60degree chamfer on the bottom instead of a fillet.

Today I printed a part that is a simple square with no fillet on the bottom. There was the usual elephant foot bulge where the part meets the bed but there was also a second bulge where the bottom shell stopped and the wall started to grow. This part is a "box" and I think the part you are designing is also a box. I suspect that the fillet is going bad in the layer that coincides with the bottom of the inside of the box, is that right?

don't know what you wish to do but what I would do in this case is try to design the around the slic3r problems in some way or even try using a different slicer.

Re: Filleted edges problem - settings?

Yes, it's a box, but it happens with other shapes.

I also thought it was coinciding with the layer inside, but I changed the inner fillet to be larger than the outer so that is was thicker at that point, so Slic3r would be able to cope (see pics). It didn't work.

I shall do as you say, and try a different slicer. Thanks for the tip.

G

Re: Filleted edges problem - settings?

You must take into account the 45 degree rule. You can not to print a radius without support. But if the first part is 45 degrees or bigger, the corner will be fine.

Re: Filleted edges problem - settings?

@RHDreambox

Yes, I realise that if you turn supports off, then you can expect mixed results, but I have supports turned on and Slic3r thinks it doesn't need them, so I assume that when it makes that decision, there are no angles greater than 45 degrees that it has found.

I've played with fillet settings in the 3D program (Fusion 360), to make sure nothing is greater than 45 degrees, but still get a mess...

G

Re: Filleted edges problem - settings?

I believe you are running into the same issues that I ran into and posted about here. On filleted edges, Slic3r would start to lay down support, but not build supports for lower layers. I found that if I set Print Settings->Support Material->Overhang threshold higher, it generates the proper amount of support. Martin.w15 also suggested setting "enforce layers" for supports could work, depending on your print.

Re: Filleted edges problem - settings?

@bobstro

Just been off and read that thread, having not come across it before. Excellent stuff, and thanks for the pointer!

G

Re: Filleted edges problem - settings?

I have been experiencing this problem as well, Slicer does a poor job of dealing with outside fillets in the XY plane.

Interestingly, when i use Cura, the outside fillets print very well. Alas, Cura is not the solution for me because it introduces other random artifacts in the walls.

Re: Filleted edges problem - settings?

Pardon my Noobeté--I don't know much about these slicers yet, but would it be possible to use the gcode generated by Cura for the base, and then append the gcode from Slic3r (or whichever else slicer) to print the rest of the model?

Re: Filleted edges problem - settings?

Pardon my Noobeté--I don't know much about these slicers yet, but would it be possible to use the gcode generated by Cura for the base, and then append the gcode from Slic3r (or whichever else slicer) to print the rest of the model?
Not necessarily impossible -- gcode files are just plain text and you could conceivably cut & paste at the appropriate layers -- but certainly not trivial or easy to maintain.

Owing to Prusa's heavy commitment to Slic3rPE and their pace of development, I'm focusing on using Slic3r as my primary tool. Once I get things close, it's relatively easy to map most of the major settings to another slicer (e.g. Cura) for things like finish. Unfortunately, Cura's outer walls are surprisingly poor in comparison, so I'm using it for "artistic" things like figures, and sticking with Slic3r for functional parts. I may map some things back to Simplify 3D if I have complex support requirements.

Re: Filleted edges problem - settings?

Owing to Prusa's heavy commitment to Slic3rPE and their pace of development, I'm focusing on using Slic3r as my primary tool.

I thought you were entrenched in the KISS army. 😆

Re: Filleted edges problem - settings?

[...] I thought you were entrenched in the KISS army. 😆
I'm a fan, but I just can't pull off a few things reliably with it yet. I'm using Slic3r for day-to-day work, getting things to that 90% mark, then shifting to other slicers for specific features. Part of the draw is what I see Prusa doing with Slic3r and what I think they're working towards. They seem to be incorporating features that will allow a general-purpose slicer to be very tightly coupled to the printer (e.g. easily setting profiles that can use varying acceleration and jerk settings) while still allowing sharing print job and filament settings between them.

KISS produces very nice looking surfaces, and seems to allow tuning things like edges (think Marvin's eyes) with great precision. The KISS approach to automatic variable layer heights is absolutely phenomenal. I just can't quite get everything together in one print yet. Even when I do, it's a hard one to recommend to newcomers.