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Tool Case Print-Aligned Hinge With 4 mm Pin
A 60 mm five-knuckle replacement hinge for stackable tool cases and toolbox lids whose moulded plastic hinge has snapped. The two 21 x 3 mm leaves print flat in one go with their knuckles already lined up. Afterwards you tap in a 60 mm length of 4 mm steel rod: the leaf with three knuckles grips the rod, and the other leaf swings on it. Each leaf has three M4 / #8 slots on a 20 mm pitch, with ±3 mm of play so they can line up with the old holes.
Print-In-Place Tileable Piano Hinge
A 150 mm print-in-place continuous (piano) hinge. It has two 22 mm leaves, 9 mm knuckles and a captive 4 mm printed pin, and prints flat and ready to swing. Each leaf has countersunk 4.5 mm holes for #6 wood screws or M4 bolts. The end knuckles are pinned solid, so you can butt several strips in a row to replace a rusted piano hinge of any length on a tool chest, case lid or access panel.
Toolbox Cantilever Tray Linkage
Print-in-place four-bar parallel-lift linkage that replaces the broken cantilever arms on a tackle box, tool chest or sewing box tray — the tray rises about 63 mm and swings 40 mm clear while staying level. Two 30 x 36 x 4 mm mounting plates (M3 clearance holes, 3.4 mm, on a 22 mm spacing) carry 7 mm pivot posts and two 70 mm centre-to-centre arms, all pivots captured with 0.5 mm clearance; overall 106 x 36 x 13.5 mm, print two and flip one for the opposite side.