I have this strange problem with under extrution on the under side? Top surface looks good? Any ideas? Using simplify 3d.
are you first layer settings different than the rest of the print? If not, perhaps they should have a higher extrusion factor or similar adjustment?
Sections like that, where there’s nothing but air under the print layer, are bridges. And that’s pretty good bridging, honestly.
The bridging is so well done, I overlooked that it was the surface under scrutiny. With that information at hand, the true first layer is difficult to determine. Is the lowest part of the model the bottom of the two cylinders near the middle of the model?
If the lowest part is the two cylinders, how did the outer ring get formed, unless it was done with supports?
@Fred_U the two cylinders are the lowest point. the rest including the outer ring is done on support. I always get that poor looking surface on first layer on support…
That’s a good bridging…but you could improve it with manual support in simplify, or optionally make another smaller object/model to support the underside
the thing is i get the samer result under a brim. Shouldn’t you expect better result for a first layer on a brim? (I know this print is on support not a brim but I get the same result)
Look its the same thing when its on the first layer when printing with brim.
The second is printed on a brim. I know that the hight over brim is adjustable (have default simplify3d setting). Anyone who has tinkered whit this setting? My brim is hard enough to remove as is
Ah, you’re not describing a brim (although that might be what simplify3D calls it, I’m not sure?) it sounds like you’re describing a raft. That is, a non-solid printed layer beneath the first layer of your actual print.
In that case, try decreasing the setting you mentioned by .05mm and see if it helps.
easiest way for a better printesult would be, to split this part and glue the cylinders on later.
Check out the printing troubleshooting by simplify3D.
Take your time find the problem step by step.
make sure that your nozzle type, extrusion multiplier and printing width are correct. if needed cheat here.
it looks to me that your printing width is to big. Simplify uses a standard 0,45 for a nozzle of 0,35
https://www.simplify3d.com/support/print-quality-troubleshooting/
I use 0.42mm extrusion width (suits best for my machine) on simplify, and go for 0.2mm width for higher x,y details with a quick tweak on speed and z layer height (also all the dependent settings)