When I create a model joining two extrusions at a right angle, using BooleanUnion, the model is free of lines and/or edges where the union occurred. However, when exported to STL and then 3D Printed, there is an edge (line) that is printed where the two were joined. It gives the impression that the objects were not aligned properly, but I believe they are properly aligned. Another way to describe it is to say it looks like two pieces were glued together with a resulting joint.
The model looks fine. Opened it in two different slicers and didn’t see that line. I did not print it however. You could simply trace the end view, extrude it to avoid any possibility of a seam.
This is commonly referred as a “banding line”. It’s probably caused by the transition from the larger thermal mass of the horizontal L-foot that’s near your heated (?) build plate to the narrower vertical “foot” that cools down much faster and is farther away from the build plate. Plastic tends to shrink when cooling down.
You could simply flip the shape and print it standing up, if your printer has enough z-clearance.
Yes, and it’s where the part starts cooling way faster than the layers below, because the geometry is narrower and sits farther away from the build plate.
It’s not a CAD problem, simply print it standing up!
