3D-printing has begun

The first parts printed are the side knobs.

3d print after sanding

Photo showing before and after sanding and assembly

The parts can be further smoothed with acetone.

Normally the minor remaining print lines is absorbed by painting, but the knobs are black plastic and I want to retain the natural look it has. So I'm thinking about it for this part.

In the meantime this is how it fits on the Pro-Cap helmet.