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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 vibration-isolating NEMA 17 motor mount: the motor bolts to a floating 46 mm plate (31 mm square M3 pattern, 22.5 mm pilot-boss bore) that is joined to a 76 x 76 mm outer frame only by four Z-shaped flexure beams, so motor buzz never reaches the chassis or the gyro. The frame bolts down with four M3 screws on a 68 mm cross pattern; print it as shown (flat, no supports) and flip it in use so the motor plate floats 6 mm clear of the chassis, leaving room for the motor screw heads.
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.
An L-bracket that mounts a NEMA 17 stepper to 2020 aluminium extrusion: 54 x 40 mm base with two M5 T-nut holes on 20 mm centres, and a 54 x 50 mm vertical face carrying the 31 mm square M3 bolt pattern plus a 22.6 mm pilot bore for the motor's centring boss. Twin 5 mm gussets carry motor torque in the strong XY direction and sit outboard of the bolt heads so a hex driver still reaches all four screws; a pair of 6 x 3 mm slots above the bore takes a cable tie for the motor lead.
A 60 mm one-piece carabiner whose gate is a built-in flexing spring arm — press it inward to hook on, and a capture nose stops it opening under load. Prints flat with no supports, no assembly, and no metal spring; sized for keys, water bottles, and bag straps.
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.