Traditional stencils require bridges to hold the center of an O, and those bridges then interfere with painting.

Through the magic of 3D printing, we can escape into the third dimension and turn the bridges into arches that don't interfere with spray paint. (Brushes or pencils... maybe. Rollers are right out.)

The STLs supplied are examples only. You'll want to customize this to the size needed for your stencil.

CraftBot Plus

No

No

0.3

10%

There shouldn't be any infill; it's all thin enough that it's solid.

Print in the orientation shown so that the arch is strong.

Glue to stencil, holding the center piece in place.