01 · Prepare
Start with the block
Clean away dust and loose material, apply masonry bonding primer, then paint the entire face white and allow it to cure.
The Garage Project 001
American Flag Cinder Block Stencil
A repeatable three-stencil system for painting a crisp American flag on a standard cinder-block face—ready for 3D printing or cutting from wood or plastic.
Version 1.0Block face: 15 5/8″ × 7 1/2″Red stripes · Blue canton · 50 stars
Complete fabrication package
Build it once. Paint it repeatedly.
The ZIP includes a dimensioned fabrication plan, exact-size SVG files for the red stripes, blue canton, and 50 white stars, plus a README with fabrication and painting guidance.
02 · Paint
Follow the sequence
- White base
- Red stripes
- Blue canton
- White stars
- Matte masonry sealer
03 · Fabricate
Print or cut
Import the SVG files into CAD for extrusion, or cut them from thin wood or plastic. Add registration stops and roughly 1/16-inch clearance per side for reliable placement.
Concrete blocks vary slightly and their corners are rounded. Measure several actual blocks before producing a final reusable frame, and make a small test-fit section before committing to the full print or cut.