A4 Notebook Assembly with Pen Cradle

Create a simple, parametric, 3D-printable look-alike notebook assembly for folded DIN A4 paper (148.5 × 210 mm). Include two separate covers (154.5 × 216 × 5 mm), a removable 216 mm spine with three evenly spaced elastic-band slots, interleaving hinge knuckles with a straight 2.0 mm pin passage for removable 1.75 mm filament pins, and simple rubber-band retention. Add a separate Ø8 × 146 mm pen mock-up and two open cradles on the front cover’s outer face. Use separate named parts. Color both covers matte black, the spine and holder dark orange, and the pen dark purple. Keep geometry simple and printable in PLA. Treat hinge clearances and holder fit as unvalidated design assumptions. Build and preview the parts incrementally; do not claim success or export files unless they are actually created.

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