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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 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 144 mm desk plate with three real meshing gears — a 24-tooth crank wheel with a domed finger knob driving two 14-tooth pinions, all captured on mushroom-cap posts. Prints fully assembled, no supports: four separate pieces, 0.45 mm clearance everywhere, spin the knob and the whole train turns.
A 139 mm print-in-place centipede: eight leg-bearing body segments joined by seven captured ball-and-socket joints, so the whole body ripples and curls in your hand. Prints fully assembled, flat on the plate, no supports and no assembly.
A soil spike that turns an empty soda bottle into a slow-drip plant waterer — press the inverted bottle neck into the ribbed socket and push the 140 mm spike into the pot. Three staggered drip ports feed water down at the root zone while the 44 mm flange keeps it from sinking.
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.