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I'd have to say this is an issue with the file, looks like an aliasing issue like you would see on an FDM printer because the poly count was too low...

Thanks a lot Anders. I have quite a high polygon count.
Here are the properties:
41778858 vertices, 13926286 polygons
STL file is 670MB.

Saturn V?

Correct :D 1/96 ;)
The whole CSM + BPC needs to be replaced ;)

This is the mesh structure

What are you using to model? is everything "closed"? Slicers hate anything that just a surface, if that makes sense? They can get creative with artifacts like that if something is left to interpretation where it starts and stops.

Don't think this is relevant for curved surfaces, unfortunately

Thanks but this is for angeled prints - I need it printed straight vertical ;)

I am using Rhino3D. STLs are checked in Magics and repaired if needed. The "lines" are in fact on four sides of the part where it cross the X and Y axis.
It seems like the very low X,Y resolution but the Chitubox is correctly set up for standard Photon. :(

Check the image below with the angle chart, because that "wall" is on a right angle, you may just be getting aliasing from the LCD as well, photons hate right angles sometimes so it's good to force them to see things as slopes.

Also, this is relevant to layer height, this particular issue is caused by the pixels of the screen.

I get these lines on vertical surfaces too, and wondering what they are. Not just cylinders, but other flat surfaces as well if perpendicular to the lcd.

Lcd pixels. Something in the anti-aliasing isn't working properly.

Alexandr Uhlik is the printer big enough for the bottom sections?
And of course where did you get the STL? I grew up in Houston in 70s and spent a lot time with my rocket model, it was taller than me.

nice!

Why can't you print at 15 degree angle?

Pete Kastner I just do not want to use any supports ;) to have a better surface :D :D :D . I will probably think about it. Thanks ;)

not 100% but i think i heard the original photon doesnt anti alias, maybe the firmware 4.2.19 allows it, or in general does it better.

The new firmware allows for anti aliasing you need to enable it in chitubox. Problem you could be having with your model is some normal's may be reversed. https://www.youtube.com/watch?v=eLgD88KFKJI&feature=youtu.be this can be done in meshmixer. The p roblem people have at times with oddball things happening to their meshes can be because of a multitude of reasons. I keep stressing that if you have a mesh it needs to be checked. Things like Netfabb and a multitude of other programs from free to commercial can do that. I think Cura can check meshes as well, I know its for fdm but if you check the mesh you can resave and use with the photon.

Even though a mesh looks watertight in software, which compensates for the way a mesh looks on screen it doesn't mean its ok to print. When you slice in Chitubox take the time to look at the slices and see if you notice any abnormalities. Yes it could be pixels from the LCD, you'd really have to be unlucky. When artists create meshes they look at the monitor, looks ok, release the model. As to how the structure of the model is, well that becomes the users problem. Imagine it this way you have a building with a lovely facade, everything looks perfect on the outside but the frame on the inside is shot, falling apart or cobbled together. Take the extra minutes check your mesh and you will generally never have any issues again unless they are mechanical.

Ray Sears the CSM stack is my own creation. The rest of the rocket is the old Revell kit ?

Alexandr Uhlik nice work