Many users have reported the inconsistent behavior of ironing on H2 machines. Take note that the “Ironing direction” value is directly relative to the direction of the top layer pattern.
Through extensive ironing testing I have managed to get a lot of my translucent pieces to be relatively equal quality to the ironing I get on the X1C and part of this involves changing the ironing direction relative to the position and dimensions of an object - if the object is longer (left to right) than it is tall, generally setting ironing to 135 deg works well; if the object is taller (top to bottom) than wide, setting ironing to 45 deg (default) generally works best. This using Monotonic Line as the top surface pattern.
All of this is to say that in the slicer, the top surface pattern for the same model on the H2S as I’m printing on the X1C are identical in terms of the directions/degrees mentioned - but they do not print the same - literally the top surface pattern below the ironing is clearly incorrect on objects within the model where other objects of the same size and orientation are correct - all with identical settings.
I have rectangular objects that are 45 L x 8 W x 3 D mm (45 mm left to right) that will be ironed at a 135 deg angle in X1C, consistently. On the model, there is one of these objects at the top and bottom of the model. But on the H2S, while the slicer is correct, the end result is not - it is very obvious that the top pattern on the top most object is correct and the bottom most object is not - not only is it not 45 deg, it’s nearly vertical. Keep in mind, these are two identical objects that are part of a group of objects that make up the same model. There is zero reason they should be calculated differently, and the slicer says they aren’t but clearly somewhere in the chain of commands they are.
It’s not clear if this is a slicer problem (incorrect gcode?) or the printer is somehow deciding it wants to print differently than the slice, but I mention ironing because this seems to be the root cause of the crappy ironing - on objects printed consistent to the slice, it’s great, and ones that are incorrect it is not.
I have reproduced this many times this week and I’d like to know 1) what is Bambu going to do to correct it after months of people reporting terrible ironing on H2 machines and 2) what could I possibly do about it in the mean time?