📐 Description

This tool is a specialized cutting guide designed for bookbinding and cartonnage (box making). Unlike standard straight rulers or small corner jigs, its "open triangle" frame is engineered to stabilize your cutter blade when trimming corners at 45 degrees.

It ensures a clean, repetitive cut on your covering materials (paper, book cloth, leatherette) to create perfect mitered corners for wrapping.

✅ Key Features

• Superior Stability: The large triangular handle provides a wide area for your hand, preventing the ruler from pivoting or slipping while you cut.
• Safety First: The height of the profile acts as a guard, keeping your fingers safely away from the cutter blade path.
• Consistent Accuracy: Guarantees a rigorous 45° angle on every corner of your project for a professional finish.

🛠 Usage Instructions

1. Glue your cardboard/grayboard onto your covering paper.
2. Hook the inner corner of the tool against the corner of your cardboard.
3. Hold the handle firmly flat against the table.
4. Run your cutter knife along the outer guide edge to trim the excess paper.
5. Repeat on all four corners.

🖨️ Print Settings

• Orientation: Print flat on the bed.
• Material: PLA, PLA+, or PETG.
• Walls: 3 or 4 walls for rigidity.
• Infill: 20% to 30% (Grid or Gyroid).
• No Supports: This model is designed to print without supports if oriented correctly.