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A cradle chassis for building a 3S (or 3P) 18650 pack: three 18.9 mm teardrop bores on 21.5 mm centres hold the cells in two 8 mm end collars plus a mid saddle, leaving both terminals flush with the outer faces at exactly 65 mm so nickel strip can be welded straight across. 82 x 68 x 34 mm, with raised + / − polarity ribs above each bore alternating for series wiring, four 3.4 mm M3 clearance holes to bolt the pack into a project, and four 12 x 5 mm zip-tie slots through the 3.5 mm base.
A four-bay bench or wall caddy that stands RC LiPo packs upright, each bay 34 x 28 mm (fits packs up to about 33 x 27 mm in cross-section — the usual 2S/3S 1300–2600 mAh class) with a dedicated 10 mm rear channel per bay so the balance lead drops over a 36 mm divider wall and its plug hangs isolated from the neighbouring pack's main leads. Overall 148 x 47 x 52 mm, with a push-up window under each bay and two M4 clearance holes (4.5 mm) through the 4 mm back wall for wall mounting.
A 110 x 62 mm vented backplate for a Raspberry Pi 4B / 3B+ with four 5 mm standoffs on the 58 x 49 mm bolt pattern (2.9 mm bores for M2.5 screws), edge stiffening ribs, two keyhole slots that drop over #8 wall screws, an M4 lock hole at the bottom, and a zip-tie bridge for power-cable strain relief. Five long vent slots keep air moving under the board and cut print time.
A 44 mm square block with four through-bores (18.7 mm, on 20.6 mm centres) that holds four 18650 cells upright, parallel and bottom-flush against the bench so nickel strip lands square during spot-welding or pack glue-up. Open-topped grab notches — one per cell, in 4-fold symmetry — let you spin a cell to set polarity, and two 5 mm ears with M3 clearance holes bolt the jig to the bench; overall 68 x 44 x 26 mm.
A gravity-fed dual-channel dispenser that stacks 6 AA and 8 AAA cells and drops the next one into a front grab window with a retaining lip. Stands 92 mm tall on a shelf or screws to a wall through the two rear ears.
A shelf that hangs on the center screw of a standard duplex outlet cover to hold a charging phone off the floor. 70 mm wide plate, 58 mm deep ledge with an 8 mm lip and a cord notch through the middle.
A weighted-footprint cradle that holds a closed laptop, tablet or notebook upright on the desk, with a 22 mm slot, chamfered lead-in edges and a cable pass-through slot in the floor. 90 × 70 × 50 mm.