Book cover corner marking guide — MiterMark | STL + STEP | JLF-238

DIGITAL DOWNLOAD — ONE PRODUCT STL, matching STEP solids, standalone CAD source, renders, instructions, validation report and personal-use license. No physical object included. Book cover corner marking guide — MiterMark JLF-238 · version 0.1 Design: João Lutz / JoaoLutzFilm, developed with AI assistance. PURPOSE 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…

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