I’m working on a Project that Prominently Features a Red PETG Top Surface that after the Printing is done gets Sanded with Grits from 400-2000 +Heat Treatment.
There is a Big Issue tho, After the Sanding is done, I can Rather Prominently see the Walls and Infill of the Layers Below. At first I suspected that I just sanded too much and that the internals weren’t really filled in 100% as they should, but after some testing and Closer Inspection, it just seems the Red PETG is just Transparent enough that I can see the layer below…
So how do I stop this from Happening? Thus Far I played around with Fan Speeds, Nozzle Temps (±10°C), Layer Hight and Ironing all Solid Layers with Mixed Success, non Satisfactory enough however…
Any filament will have some non-zero transparency when laid in a thin layer. Additionally the bridging across infill will add some surface distortion that can also be visible.
Is this a multicolor print with a filament swap?
Add more 3-5 more top layers of red petg to make it more opaque. It may also help to use a different infill style, like lightning, or increase density/add multi-line.
The Infill is 100% for the entire Object. Yeah it is a Multifilament system swapping once between black and red PETG