Book cover hinge spacer — HingeLane | STL + STEP | JLF-239

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 hinge spacer — HingeLane JLF-239 · version 0.1 Design: João Lutz / JoaoLutzFilm, developed with AI assistance. PURPOSE Set a repeatable 7 mm gap between separate cover boards. A narrow flat spacer with broad lift tabs at both ends, avoiding fingers in the gluing gap. DIMENSIONS 7 mm nominal spacing; 148 mm cle…

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