Book cover corner marking guide — MiterMark | JLF-238

COLOR: BLACK. The supplied print is black; render colors are illustrative. Mark a consistent corner allowance on decorative covering paper. A simple L corner datum and diagonal pencil slot, with the fixed allowance engraved on the body. DIMENSIONS 66 × 66 × 3 mm; pencil-slot centre line is 4 mm perpendicular to the board corner; slot width 1.2 mm. CONTENTS 1 printed pieces: 1 × mitre-marker. Material: PLA. SUPPLY SEPARATELY Paper, book board, fine pencil and separate cutting tools. USE AND ASSEMBLY With paper below the book board, seat the inner L corner around the board corner. Mark through the slot with a fine pencil, remove the guide, then cut separately. The 4 mm setting is a fixed option, not a universal allowance: choose it for your covering method and board thickness. Keep glue off the guide. Do not run a blade against plastic. Images are renders of the actual CAD. Geometry and reference slicing checked digitally; physical fit, finish and service life have not been established by those checks. Printed to order. Shipping and taxes are calculated at checkout. Design: João Lutz / JoaoLutzFilm, with AI assistance.