Pololu 30:1 Micro Metal Gearmotor HPCB 6V, extended motor shaft (#3072): body, D-shaft and M1.6 face holes — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft/  (sheet CC BY 4.0)
Basis: Pololu's micro metal gearmotor 3D STEP models (extended-shaft carbon-brush version), checked against the Pololu #3072 product page and the micro metal gearmotor dimension diagram.
Catalog version: 2026-10-20

Overall (mm): length 40.3, width 12.0, height 10.0
- Axis along the length; 0 is the tip of the extended rear motor shaft. Cross-section 12.0 × 10.0 (Ø12 can with two flats).
- Motor can and back cap 15.4 long, gearbox 9.0 long; the gearbox output face is 30.3 from the rear shaft tip.
- Output: Ø3.0 D-shaft (0.5 deep flat) reaching 10.0 past the gearbox face, with a Ø4.0 bushing 0.72 proud of the face.
- Two M1.6 threaded holes in the gearbox output face, diagonal pair at (±3.80, ±2.80) from the shaft axis.
- Rear: Ø1.0 extended motor shaft, about 4.5 past the motor for an encoder; HPCB terminals 6.3 apart. The same body applies to every HPCB/HP/MP ratio except 1000:1.
- All dimensions are exact nominal millimetres, true size, with no tolerance added.

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Pololu: 30:1 Micro Metal Gearmotor HPCB 6V with Extended Motor Shaft (#3072) — web — Publisher's page; dimensions are facts — https://www.pololu.com/product/3072
- Pololu: Micro metal gearmotor dimension diagram (PDF) — web — Publisher's page; dimensions are facts — https://www.pololu.com/file/0J949/micro-metal-gearmotors-dimensions.pdf
- Pololu: Micro metal gearmotor 3D STEP models — web — Publisher's page; dimensions are facts — https://www.pololu.com/file/0J2042/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft/index.json
API: https://xemstudio.com/api/geometry?object=pololu-3072-micro-metal-gearmotor-30-1-hpcb-6v-ext-shaft