I know there is a thread in this forum somewhere talking about this issue but I can’t seem to locate it. What is causing the change from Matte to glossy. No modifiers added, no change in speed. Default settings with a .4 Nozzle, PLA+. (All the other wavy lines in the pics are because of the camera, they are not in the print.) Filament was calibrated in Orca. No other issues that I have noticed but admittedly, this is the largest print I have done in a while.
Is there an change in Infill? A change in total layer time?
Can you post pictures from the slicers print speed view after slicing?
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No changes in anything. Let me find the print and re-slice it and post it. Probably be a few minutes to find it since one of my engineers thrust this on me as I was trying to leave yesterday.
Here you go. The green section is immediately below where the “Matte” area starts. However, the green section is also glossy like the top section (see pic below)
Hello highrise955,
Are you using any custom fan settings or cooling fan time in Orca 1.6.3
What is the cooling showing on the preview ?
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I just realized these pics I am showing are in Orca 1.6.2. I never upgraded it at the office, only on my home PC. Will that matter?
Maybe it might be a slicer bug.
What do you see in the layer time preview ?
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When you have time can you see what the 1.6.3 shows also.
It looks like the nozzle temp at the 45 overhang is ok plus it has lower overhang speeds then it hits the 90 wall with the higher speed and the nozzle temp is too low for the flow rate until it catches up and it is shiny black again.
Can you link the file to me ?
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Not sure it’s really the same for you, but I noticed this happening when print speed changes between overhangs and vertical walls. I tend to limit the outer wall speed to 60mm/s to avoid this.
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I can send you the file but how do I do that here without making it public?
Speed and temp can change from glossy to matte. That implies that the fan also has an affect.
You will likely see this if you print a simple cube at the low end of the filament recommended temp range and then again at the high end. If I remember correctly, when it gets hotter it ends up more matte.
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I sent you a PM message.
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File sent…I think. 
Its very common artifact when speeds get high during printing. Some filaments react this way to temp changes too, but speeds tend to be a big contributor. I’ve seen something that related it to the inability of the hot-end to keep up with the flow rate and speed being printed. Which makes sense, but I never dove in any deeper than that.
You can print anything and see the matte textures pick up almost in lockstep with the speed and flow rate slicing traces once you get over that magic number for your hardware.
If you want to avoid it run a max flow test and see at what flow the filament tends to go matte and stay below it. Unfortunately, that will likely be rather slow. Another option is to try a higher flow hot-end, like the clones with a CHT nozzle. They seem to bump the flow rate up a little which will give you a little more headroom on speed, although I still think you will need to come down in speed and max flow rate as well.
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Ok I found a working solution with custom G-code.
I’m going to reach out to the Orca team to see if we can get an automatic solution 
eSun PLA Pro
Block 1 speed 90 mm/s @ 45 and wall @ 172 mm/s = 220c
Block 2 Speed 90 mm/s @ 45 and 10mm up past thick infill then @ 172 mm/s = 220c
Block 3 speed 90 mm/s @ 45 and wall @ 172 mm/s added 10c to nozzle = 220c to 230c
If I were to guess, what you are seeing is the temp change creating a better flow and stopping the improper extrusion. I think (but can’t say for sure) this under-melt is still molten enough to flow out at plenty of speed to satisfy the speed requirements, but is not a complete melt that allows the filament to properly mix and coalesce at the tip. Note… That last part is just my guess and can be totally wrong.
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Yes the temp change G-code was the golden ticket and not slowing the print speed down to fix it.
The test was also to see how the infill and wall taper was reacting in this area of the part.
I would like to get us an orca slicer solution 
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Why not just set the nozzle temp to 230? It seems that 230 works better