A NEMA motor assembly concept with a controller PCB, four proposed M3 screws and spacers, four motor-lead splices, and a JST-SHR connector harness; rear mounting remains unverified.
## Motor and hardware assembly preview
The 1.12.1 assembly rotates the motor’s fixed-wire outlet toward the board’s JST edge. Four colored leads take a short loop through insulated splices to a 28-AWG JST-SH pigtail. The SHR-04V-S plug seats in the BM04B-SRSS-TB header at the catalog’s 6.3 mm mated height. Pin order is black A+, green A−, red B+, blue B−. There is no motor-side socket.
[Assembly details](docs/top-assembly.md) · [Full assembly](artifacts/top-assembly/assembly-complete.png) · [JST connection](artifacts/top-assembly/assembly-jst-connection.png) · [Top view](artifacts/top-assembly/assembly-top.png) · [Native assembly JSON](assembly.circuit.json).
The saved 1.12.0 PCB and fabrication files are preserved. Nominal CAD checks pass for conductor separation, component clearance and plug alignment. Rear motor retention and physical crimp/latch fit remain unverified.
# NEMA14_RP2040 — hardware prototype
**CAD qualified for hardware-prototype publication and JLCPCB engineering/order review.** All 63 physical nets are connected; native DRC has zero errors and warnings. Fresh default and order-review CAM audits pass. Native passive-orientation advice retains its actual command status and requires supplier pickup confirmation.
35 × 35 × 1.6 mm, four layers. Actual JSON and drills verify four Ø3.2 mm mounts at (±13, ±13) and minimum via drill/pad Ø0.30/Ø0.45 mm. Upright USB-C sockets occupy opposite edges, leaving 23.300 mm between the defined 10 mm plug housings. The nominal model screens maximum Ø6 × 3 mm heads within a Ø6.4 mm envelope and an Ø6 mm tool path.
All 81 fitted parts are TOP SMT; seven bare top test pads and three BOTTOM encoder/DNP parts are excluded from factory placement/paste. USB/PD, JST-SH A+/A−/B+/B−, TMP102, LEDs, buzzer, driver, flash and the short TOP oscillator are retained. Exact electrical source arrays and all 13 oscillator geometries match the GitHub baseline.
[Current evidence and blockers](docs/opposite-edge-review.md) · [23-check receipt](artifacts/resume-validation.json) · [Connectivity](artifacts/physical-connectivity.json) · [JLCPCB package](artifacts/jlcpcb-review/JLCPCB-OrderReview.zip) · [Six-sheet schematic](artifacts/schematic-a4.pdf).
Supplier/process/pickup approval, physical cable/screw/harness checks and firmware/electrical/thermal bench testing remain outstanding. Rear motor fit and encoder shaft/magnet/air gap are unverified. No order or payment was submitted.
Saved 1.12.0 board SHA-256: `f45cf8eac9c29d17873cfb8719b3996c870c2552bf8077f68041e46fed1c5e4d`.
