Avoid fillets and use chamfers if at all possible. Fillets will often call for printing supports or just look bad. But the common 45 degree chamfer will be easily printed and look better when done.
The corner is laying down. The would be no supports in either case, and the fillet avoids hard turns while the chamfer still has two (less sharp) angles.
Like 99% of things in 3D printing, “Xs are to be preferred over Ys” is an entirely circumstantial statement that is never going to be true all of the time.
“Preferred” doesn’t mean “all the time”. But chamfers are easier to get nicer results with the majority of the time because they are easier for the printer to make.
Fillets are easier to print horizontally than chamfers as they spread the acceleration (i.e. the thing that makes sharp corners bad) over the while fillet instead of just splitting it into two stages like a chamfer would.
Chamfers are easier to print vertically than fillets as the overhang is limited and consistent.
There’s no overhang for a horizontal corner as you’re printing the same shape onto the layer below, and no acceleration for a vertical corner as it’s entirely separate layers so the toolhead never has to follow the path of the corner.
It sounds like you’ve read (or only remembered) half a rule. It’s not the case that either half of the rule is used the majority of the time because 3D printers are used to print 3D objects, so they always produce objects with both horizontal and vertical edges.
Avoid fillets and use chamfers if at all possible. Fillets will often call for printing supports or just look bad. But the common 45 degree chamfer will be easily printed and look better when done.
Chamfers are to be preferred over fillets.
The corner is laying down. The would be no supports in either case, and the fillet avoids hard turns while the chamfer still has two (less sharp) angles.
Like 99% of things in 3D printing, “Xs are to be preferred over Ys” is an entirely circumstantial statement that is never going to be true all of the time.
“Preferred” doesn’t mean “all the time”. But chamfers are easier to get nicer results with the majority of the time because they are easier for the printer to make.
Fillets are easier to print horizontally than chamfers as they spread the acceleration (i.e. the thing that makes sharp corners bad) over the while fillet instead of just splitting it into two stages like a chamfer would.
Chamfers are easier to print vertically than fillets as the overhang is limited and consistent.
There’s no overhang for a horizontal corner as you’re printing the same shape onto the layer below, and no acceleration for a vertical corner as it’s entirely separate layers so the toolhead never has to follow the path of the corner.
It sounds like you’ve read (or only remembered) half a rule. It’s not the case that either half of the rule is used the majority of the time because 3D printers are used to print 3D objects, so they always produce objects with both horizontal and vertical edges.
It depends on the orientation you print in.