Steppy Nozzle Wrench

A 3D printed torque wrench design inspired by the LDO mascot - Steppy.

The dimension is designed to match a NEMA14(23mm height) stepper motor. There's also a version without the LDO logo.

If you like my design, support me through the following platforms. Thank you!
ko-fi, PayPal.me 

BOM

Printed Parts

The torque of the wrench depends on the print settings and material, so you may need to test rotors with different number of fins.

All the STLs are oriented for printing without support. Print with 0.4mm line width, 0.2 mm layer height, 3 perimeters, 30% infill.

Extra Hardware

• 2 x M3x16 SHCS/BHCS
• Bits with 1/4" (6.35mm) hexagon drive
• One D6xH3 round magnet (Optional, act as the bit retainer) 

Assembly

The magnet can be inserted at the bottom of the rotor.

The M3 screws are threaded directly into plastic. Don't over-tighten them.

How Much Torque Does It Provide?

First of all, this is not a tool designed for heavy duty or high precision usage.

The torque varies a lot by materials and print settings. Usually PLA is stiffer than ABS and PETG. From the description of Fixed Torque Wrench Handles by A_R_B, the bit would possibly strip the printed holder for torque over 3Nm.

For reference, I printed the 8 fins rotor in PETG and it yeilds about 1.8Nm.

The recommended method is to try printing out several rotors with different number of fins and pick the one that meets your usage. The rotors share the same case.

Acknowledgement

• Fixed Torque Wrench Handles by A_R_B on Thingiverse and Printables for the inspiration of the rotor design.
• LDO mascot - Steppy for the logo on stepper motor.

Demo Video

Disclaimer

This is not an "official" LDO motors project. I am just a designer that like their product and had an eureka moment.

Changelog

2025-12-01

• Refined the whole design
  • Reduced the overall height
  • No more overhangs
  • Optional magnetic bit retainer 

2022-03-07

• Initial release