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Trying To Add Brim  

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Gking
(@gking)
Active Member
Trying To Add Brim

Printing a building that I got from the internet.  I want to add a brim to be sure it sticks to the plate.  When I specify a brim in Prusa Slicer 2.4.2 I get a brim in a small part of the front of the building but nowhere else.  Tried a raft with the same results.  I have been able to print similar buildings with a brim - no problem.  Any idea what's going on here?  Thanks, George

Posted : 21/05/2022 8:15 pm
fuchsr
(@fuchsr)
Noble Member
RE: Trying To Add Brim

Maybe the model is not sitting flat on the surface but on a small angle. Use the F key to make sure it's properly placed. 

Posted : 21/05/2022 8:41 pm
Gking
(@gking)
Active Member
Topic starter answered:
RE: Trying To Add Brim

The brim does not show up when doing a G code preview.   I just loaded another building file and sliced it with a brim and it worked fine - shows up on the preview also.

Thanks for the tip about the F key.

George

Posted : 21/05/2022 10:09 pm
fuchsr
(@fuchsr)
Noble Member
RE: Trying To Add Brim

Maybe time to upload a zipped 3mf project file (PrusaSlicer->Save as project, then compress with the Windows or MacOS compress utilities). This will show us the STL and your settings. No need to upload any gcode files. 

Posted : 21/05/2022 10:25 pm
Gking
(@gking)
Active Member
Topic starter answered:
RE: Trying To Add Brim

I think I compressed this file correctly.  Let me know if there is a problem.  Thanks so much for taking the time to do this.

George

Posted : 21/05/2022 10:49 pm
fuchsr
(@fuchsr)
Noble Member
RE:

EDIT: My version of the 3mf attached.

 

As I suspected, the bottom of the building is not a perfectly flat structure but there's a slight angle in it. You can see this in two ways. When you slice it and look at the Preview, you can use the slider on the right to just look at the first layer. You'll see that the right side of the building is on the plate but the rest of the building is not. Also, when you select the building and press F, you see two areas on the base highlighted that are at a slight angle to each other. 

So, to remedy this situation, two ideas: If this is your model, fix the problem with its base. If not, you can select the building, press C for cut, and cut away some part of the base. I set Z to 0.5mm, keep upper part, and it created the brim perfectly. Having said that, you shouldn't really need a brim for this model.

This post was modified 2 months ago by fuchsr
Posted : 21/05/2022 11:21 pm
Gking
(@gking)
Active Member
Topic starter answered:
RE: Trying To Add Brim

Thank you so much for finding the problem and for the education! 

Really appreciate this - George

Posted : 22/05/2022 1:36 pm
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