Take the guesswork out of crown molding installation with our precision-engineered Preformed Inside Corner Pieces. Designed for clean, professional-looking transitions, these corners eliminate the need for complicated miter cuts—saving you time, materials, and frustration.

Each piece is 3D printed using durable, eco-conscious PLA and features smooth contours that seamlessly blend with standard molding profiles. They’re designed to pair perfectly with the commonly available 2 5/8" crown molding found at most home centers. A thoughtfully crafted front face reveal stands slightly proud of the molding, adding visual depth and providing a subtle margin for error—ideal for walls that aren’t perfectly square.

Choose from 87° to 93° in 1° increments to ensure a snug, gap-free fit. And to make installation even easier, each piece is clearly stamped with its angle on the back—no guessing or mixing up your corners. Just keep your room layout graph handy for reference.

✔ Available angles: 87°, 88°, 89°, 90°, 91°, 92°, 93° ✔ Lightweight and paintable surface ✔ Precision fit for standard 2 5/8" crown molding profiles ✔ Angle marking on back for easy identification ✔ Front face reveal adds depth and installation forgiveness ✔ Made in the USA using high-quality PLA ✔ Manufactured by Northwoods Crafted Company LLC, a proud Veteran-Owned Business

To ensure a smooth installation process, positioning jigs are available to help hold the crown molding as you nail it in place. These jigs act as an extra set of hands, maintaining proper fit and alignment—especially helpful when working with long runs of molding.

We also recommend downloading our free Room Layout Graph and reviewing the Corner Angle Measurement & Installation Instructions. These resources will guide you in choosing the perfect angle and help deliver crisp, professional results every time.