I am pretty sure this is a Studio issue and not anything to do with the printers themselves. I have this stand I made for holding coins, it has an American Flag, so 3 colors, it prints it flat and glued on, then a round disk the coin goes into, also flat and glues on to the mase. I use Silk PLA, Bambu settings for the base, basic red/white/blue and black for flag and letters. Same filament in both machines, same settings. Both machines loaded with .2 nozzles.
Slice the job on the H2D, 4 hours 2 minutes.
Slice the exact same job on the H2C, 5 hours 32 minutes.
I went through everything and split out the parts to separate plates and found out that the H2C slicing SILK PLA is the issue. It takes 1 1/2 hours longer to print the same exact filament in the H2C as it does in the D. This has GOT to be a slicer bug.
When I replace the Silk with Basic PLA, the H2C does print the entire job faster. I am wondering now just how much time got wasted on my last 7 color job that used Silk, it was 38 hours long. Going to go back and replace the silk with basic and compare them, as well as slice it on the D too.