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…
I mainly use Elegoo Rapid PETG. I hated PETG because of it’s very low speed, but this filaments is a real game changer. Prints fast and easy. A bit stringier than PLA. Idry it before storing, which helps a lot. I don’t think I have seen anything inside with 3 or more top layers. What filament are you using?
To continue using the filament you have, you’ll need more top layers as suggested already. The other alternative is to buy a different brand of red PETG with lower light transmission.
I mostly print in PLA, but there are some brands that are almost translucent while others are opaque after a 0.2mm layer or two and this is all just basic color PLA not anything fancy like silk or the like.
Also you might try lowering the infill. 100% is typically pretty excessive for strength purposes (60-70% is enough) and ironing the top surfaces might help reduce the amount of sanding needed.
I would try adding more top layer shells. That way there’s more plastic between the surface and the first infill layers.
The Infill is at 100% for the entire Objekt
Infill is different from top layer shells. The infill is a different pattern from the top and bottom layers, and a different pattern from the walls.
Usually the top/bottom shells are set to 5 by default, and the walls are 2. If you bump the top and bottom layers to something like 10 or 15, they’ll be much thicker before it switches to the infill pattern.
Hm I see, ill give it a shot thanks!
So No matter what I try, It only does Infill before 1 Layer of Top Surface. No settings seem to trigger anything else. Even putting infill at 0% makes it just hollow instead of producing more Top Surface Layers…
It isn’t an “infill” setting. It’s “top/bottom” settings. I don’t what slicer you’re using, but every slicer should give you the option to set the number of top layers and bottom layers.
Yes, top layer is set to 5 layers yet it only does 1 Top Layer since thats the surface. Rest is handled as Infill.
I tried everything from 1-100 Top Layers, nothing changes. Insides still get printed as Regular Infill.
Can you please upload some screenshots of the model you’re printing in the slicer, and the related settings? That’s really odd behavior.
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
