Are all 3D Printers equal or are some better than others ?
I only have experience with my UP3D - which prints to 0.15mm res, so I can't speak for other brands.
I consider myself relatively a n00b in this field, my experience being mainly 30+ years in cottage-industry level low run resin production at non-commercial hobbyist standard.
I have already seen a difference between the finish on the same item printed between different spools of ABS indicating the melting point has an impact. More experimentation is required - the atomised acetate technique, the MEK bath, rigourous sanding are all methods that can be employed to smooth out the surface, I'm still having way too much fun rendering and printing at this stage !!!