We decide on a Module of 2mm (good size for standard 3D printers). We apply this to both gears.
For Elias, this wasn’t just about mechanical advantage; it was about the "Perfect Fit." He wasn’t printing toys; he was restoring a 1920s clockwork telescope he’d found in a basement in Prague. The original brass gears were long gone, dissolved by rust and time.
The generator does the heavy math and exports a watertight , which you then slice and print.
PLA: Excellent for low-load, low-speed prototypes due to its high rigidity. gear+generator+stl
When the print is finished, carefully remove any support material if you printed a gear that required it (although the generators mentioned often design without). A light sanding of the gear's teeth and a small amount of dry lubricant (like PTFE powder or a light grease) will make the printed gear turn much more smoothly when placed in its final assembly.
to match your motor shaft (e.g., 5mm for a standard NEMA 17 stepper motor).
Elias looked through the eyepiece. The clouds had parted, revealing the jagged craters of the moon, tracked perfectly by a piece of plastic born from a few lines of code. We decide on a Module of 2mm (good
This is the gold standard for quick STL generation.
also offers a streamlined online generator, capable of creating spur, helical, and herringbone gears. As is often emphasized for 3D printing projects, these models are designed to print without support structures. You can customize a gear's module, tooth count, width, shaft type, and hole diameter, then download the STL.
Another notable tool is a generator hosted at gears.dmtrkovalenko.dev . This browser-based tool is praised for its simplicity and speed, making it ideal for quick prototypes, repairs, and "I just need this to spin" moments. It provides a live 3D preview as you adjust the number of teeth and other sizing parameters. You can then download the result as an STL file. The original brass gears were long gone, dissolved
Use a lower layer height (0.12mm to 0.16mm) for smaller gears. This ensures the involute curve of the teeth prints smoothly, reducing friction.
I can recommend the exact generator settings or tool script to use for your project. Share public link