There are three parts to this sign, all of which can be printed without supports:
No Coronavirus White.STL
This is the sign base, which I recommend printing in white.
- Alignment: The STL file should already be aligned for printing, but I recommend printing on its side so that the first layer looks like a V. Make sure to have any part cooling fans blowing in a way that won't add pressure or warp the flat surfaces. (For example, have the tip of the V pointing away from the fan.)
- Infill: 0% works great.
- Shells: 2 works great.
- Supports: Nope!
No Coronavirus Black.STL
This is the coronavirus icon that goes in the center of the sign, which I recommend printing in black.
- Alignment: The STL is aligned by default such that the side laying flat on the bed is the side that faces the outer part of the sign. If you have a textured bed and don't want that texture to show, feel free to flip the STL vertically.
- Infill: I used 10%, but it's up to you.
- Supports: Are you kidding?
No Coronavirus Red.STL
This is the circle with a slash through it, which I recommend printing in red.
- Alignment: Like the coronavirus icon, the STL is oriented so that the side laying on the bed surface is the side that people see. You can flip this if you like, but your printer had better be amazing at bridges, because there is a large gap for the coronavirus to fit into.
- Infill: I used 10%, but whatever floats your boat.
- Supports: Nada.