What are these straight lines?
Hi, I have a L-shape frame. Half of it has support since it is about 1mm raised from the base. Underneath this half, I see some straight lines (highlighted in orange) under the support. Are they part of the model or part of the support that should be removed?
RE: What are these straight lines?
That is the bottom layer of the model, they look to have been printed as bridging as they are loose and not fused together. I’m guessing you had don’t support bridges enabled so it placed support under the perimeters but then tried to bridge across the middles.
While that occasionally works, for larger flat areas it usually doesn’t. It’s better to turn off don’t support bridges and then make sure you use support interface layers and using the slice preview ensure that the support generated is at 90 degrees to the bridging bottom layer. This will give a ‘better’ but still not great surface.
It’s even better to design your parts to avoid geometry that makes 3D printing difficult 😀
I did some experiments with Super Slicer for this situation as it allows you to set the density of lines of the bridging. When set to 133% instead of the default of 100 it makes the, squish together more. Supports can be a bit more difficult to remove but the surface was much better.
RE: What are these straight lines?
That is the bottom layer of the model, they look to have been printed as bridging as they are loose and not fused together. I’m guessing you had don’t support bridges enabled so it placed support under the perimeters but then tried to bridge across the middles.
While that occasionally works, for larger flat areas it usually doesn’t. It’s better to turn off don’t support bridges and then make sure you use support interface layers and using the slice preview ensure that the support generated is at 90 degrees to the bridging bottom layer. This will give a ‘better’ but still not great surface.
It’s even better to design your parts to avoid geometry that makes 3D printing difficult 😀I did some experiments with Super Slicer for this situation as it allows you to set the density of lines of the bridging. When set to 133% instead of the default of 100 it makes the, squish together more. Supports can be a bit more difficult to remove but the surface was much better.
Yes, after I disabled the "don’t support bridges" option, it printed much nicely. Thank you very much.