--- In STMFC@yahoogroups.com, "pullmanboss" <pullmanboss@...> wrote:
Thanks for the more detailed explanation, Tom. So, while the resolution is the same, the effect on surface finish is certainly detrimental. Which leads me to conclude that Fused Deposition Modeling (FDM) isn't the right process for mechanical parts like brake cylinders and valves which by their very nature are going to have overhangs somewhere.
I wonder about SLA? From photos of parts like dental crowns it appears that can build an overhang, so long as it is continuous with all the fused material on a given layer, to a point... the Asiga web page makes a claim that their software automatically calculates where "support structures" are needed. The problem is, these support structures are then one with the finished part, and have to be cut away by hand, maybe just a sprue nipper job, maybe much worse.
As to the surface finish on the part in my photo relative to everyone else's, keep in mind my triple valve is but a fraction of the size of what anyone else has posted photos of, so the magnification is much higher.