UM3, Cura 3.2, 0.25 mm printcore designs not slicing properly, help?

[americ 0]

Hello!

 

We recently got our hands on an UM3, and have been happily printing away with the standard 0.4mm print cores! 

 

After learning and successfully printing designs made in Fusion 360, we decided to purchase a 0.25mm print core for the UM3. Cura is up to date to version 3.2, which supports the 0.25mm print core.

 

That said, we have now been struggling to properly create printable designs on the UM3 with the 0.25mm print core:

 

We would want to create, for example, a 5 cm x 5 cm x 5 cm cuboidal shell, that has 0.25mm wide walls (modeled in the attached Sketch.png). 

 

As per normal, we then export the finalized Fusion360 body as an .STL, and open it in Cura 3.2. That said, Cura does not slice the shell, and layer view reveals that no layers are being sliced.

 

Is this displaying as intended? Does anyone in the community, or from Ultimaker, have any documentation/tutorials/guides they could point me towards with regard to modeling with the 0.25mm print core in mind.

 

 

[gr5 990]

You have a lot of choices here.

 

First of all, you modeled infinitely thin walls in sketchup so that's what you got.  Infinitely thin walls.  But I know that's not what you wanted (or maybe I'm wrong - maybe you modeled 0.25mm thick walls in which case read the next paragraph).

 

One choice is to model the walls in sketchup - make them 0.25mm thick.  This is a reasonable option.  Then make sure you check the box in cura for ultra thin walls and you probably want to set your line width less than 0.25 - maybe 0.22 so cura will be happy and your quality will probably be better.

 

However if your part will always be like this - no holes through the walls - no top or bottom - then much better to model it as a cube (by the way, everyone should have a cube.stl handy - you can add it to cura and stretch it to any height/width/length with the scale button).  Then when slicing tell cura 0% infill, walls at 0.25mm and disable top and bottom infill.  This will give you a much thinner result and it will happen on only one pass.  You can even set line width down to 0.2mm and the quality should be fine if you want really thin walls.

[gr5 990]

Oh and if you are going to be using sketchup to make 3d models (not the best choice but hey - it works) then you need to read this:

https://i.materialise.com/blog/3d-printing-with-sketchup/