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This is a listing for one Fulling Motor model FL42STH47-1206A NEMA 17 (42 x 42 mm) high torque 1.8 degree stepper motor, ideal for the RepRap Prusa, Mendel90 and similar 3D printers, as well as CNC and robotics applications.
For more information on choosing stepper motors for Reprap check the wiki: http://reprap.org/wiki/Stepper_Motors.
The holding torque is particularity important, especially for Extruder, X and Y axis. These motors are 4.4 kgcm (44Ncm) and we use them successfully on our printers, even at high speed.
We have sold hundreds of these motors over the past few months and are confident that they are the lowest-priced high-torque NEMA17 stepper motors on the UK market.
The motors are manufactured by one of China's leading hybrid stepper motor manufacturers, established in 2000 as a German-Italian-Chinese joint Venture:
| Item | Specifications |
| Step Angle | 1.8 degree |
| Step Angle Accuracy | ±5% (full step, no load) |
| Resistance Accuracy | ±10% |
| Inductance Accuracy | ±20% |
| Temperature Rise | 80.C Max |
| Ambient Temperature | -20.C~+50.C |
| Insulation Resistance | 100MΩMin. ,500VDC |
| Dielectric Strength | 500VAC for one minute |
| Shaft Radial Play | 0.02Max. (450 g-load) |
| Shaft Axial Play | 0.08Max. (450 g-load) |
| Max. radial force | 28N (20mm from flange) |
| Max. axial force | 10N |
The motors we are selling are the 6-wire (dual bipolar/unipolar) version of Model FL42STH47, which we have converted for use as standard 4-wire bipolar motors by removing the extra 2 wires (white, yellow), as shown in the wiring diagram below:

| Model No. |
Rated Voltage |
Current /Phase |
Resistance /Phase |
Inductance /Phase |
Holding Torque |
# of Leads |
Rotor Inertia |
Weight |
Detent Torque |
Length |
| Single Shaft | V | A | Ω | mH | Kg-cm | g-cm2 | kg | g-cm | mm | |
| FL42STH47-1684A (4-wire) | 2.8 | 1.68 | 1.65 | 2.8 | 4.4 | 4 | 68 | 0.35 | 200 | 48 |
| FL42STH47-1206A (used in 4-wire mode) |
Cable length 0.3m, supplied with 0.9m of loose colour-coded extension cable and heatshrink sleeving to make it up to a maximum 1.2m. Frame Size: Length = 47mm

Shipping
Motors are carefully packaged, wrapped and boxed. We offer the following postal/shipping services
Please write to us at think3dprint3d@gmail.com to request a quote for courier shipping outside the UK.
Orders received before 10:00 am UK time Monday to Friday we aim to ship the same day, otherwise the following day. Orders received later on a Friday or before 09:00 am UK time on Saturday will normally be shipped on Saturday (Monday for courier shipping).
| First item | Subsequent items | |
|---|---|---|
| National (United Kingdom) | £3.50 | £0.50 |
| Continental (Europe) | £10.00 | £2.50 |
| Rest of the world | £14.00 | £5.00 |