Usongshine Nema17 Stepper Motor 17HS4401 with T8 Screw Lead 8mm 300mm/400mm 42BYGH Review (2026)

What this motor is

This is a Usongshine Nema17 stepper motor, model 17HS4401, sold with a T8 lead screw already fitted to the motor shaft rather than sold separately for a coupler to join. The T8 screw has an 8mm diameter with an 8mm lead, the common size used for Z-axis motion on many hobbyist 3D printers, and the listing offers 300mm and 400mm screw lengths to match different frame heights. The 42BYGH designation refers to the motor's 42mm frame size, the standard Nema17 body size used across most desktop 3D printer stepper motors.

Why an integrated screw helps

On many stock printer Z-axis setups, the stepper motor and lead screw are two separate parts joined by a flexible coupler, and if that coupler is misaligned or loose it can introduce wobble that shows up as visible banding or ribbing on tall prints. By fixing the screw directly to the motor shaft at the factory, this design removes that alignment step entirely, since there is no separate coupler to tighten or shim. For anyone chasing Z-axis wobble as a print quality issue, swapping to a motor with an integrated screw is a common and effective fix compared with troubleshooting a coupler.

Choosing the right length

The 300mm and 400mm screw length options need to match the printer's actual Z-axis travel and frame height rather than being chosen freely, since a screw that is too short will not reach the full travel range and a screw that is too long may not fit inside the frame or could interfere with other components. Printers in the Ender 3 size class commonly use shorter Z screws, while taller printers or ones modified with a Z-height extension may need the longer 400mm option. Buyers should measure their existing Z screw or check their printer's documented Z travel before ordering rather than guessing between the two lengths.

Durability considerations

Because the screw is permanently fixed to the motor shaft rather than removable, any damage to the screw, such as bending it during a bed crash or mishandling during installation, means replacing the entire motor and screw assembly rather than just swapping a cheap screw. This is a reasonable trade for most users, since a bent screw is not a common failure mode under normal use, but it is worth handling the part carefully during installation and avoiding dropping it or forcing it into a misaligned mount. The motor itself, being a standard Nema17 body, should have a normal working life similar to other stepper motors in this size class.

Where this fits in a printer build

This kind of integrated motor and screw combination is a common choice for both replacing a failed Z-axis motor and for DIY builds or kit printers that need a Z-axis assembly from scratch. Because it is a 2-phase, 4-lead motor, it should wire into most common stepper driver setups without needing special adapters, matching the wiring style used by the vast majority of desktop 3D printer mainboards. Anyone upgrading a single Z motor to a dual Z setup should confirm their printer's frame and mainboard actually support two Z motors before buying a second unit, since not every printer is built for that configuration. Checking the mounting hole pattern against the existing motor is also worth doing before ordering, since not every 3D printer frame uses the same bracket spacing.

Frequently asked questions