dummy - GT2 16tooth and 16toothless idler

thingiverse

I downloaded a GT2 pully from somewhere, I thought it was accurate enough for my needs. However, upon closer inspection, I discovered that some of its dimensions were different from the actual idlers I had on hand. The flanges and channels around the bore were completely off as well. As an engineer, I rely heavily on precise measurements to design reliable mechanisms. For instance, determining the optimal size for a washer or bolt can make all the difference in minimizing friction on moving components. So, I decided to create my own pully from scratch. It's not 100% accurate, but I've measured and modeled the critical bearing surface around the M3 bore with great care, along with the various gaps and protrusions surrounding it. At a resolution of 100 microns, I'm confident that this design will serve as a solid basis for further development. This pully is not intended for printing; rather, it's meant to be used as a reference point for designers who need accurate dimensions. It's one of the most widely available idlers on Aliexpress, and I've made sure to include detailed models of its bearing and mounting components. While my measurements may not be exact in every detail, they're still remarkably accurate, especially considering the limitations of my measuring equipment. I recently updated the model by adding more details to the bearing's construction and its mounting within the idler. Although I couldn't measure the side profile of the ZZ bearing with perfect accuracy, my estimates are still good enough to ensure that the bolt can bear on it without binding the rotational freedom of the outer bearing. To improve the model further, I added a 0.05mm axial gap between the bearing seats in the idler casing. This will make it easier to eliminate duplicate vertices and prevent unnecessary merging of objects during slicing or editing. TL;DR: This pully is designed for designers who need accurate dimensions for their projects. It's not intended for printing, but rather serves as a reliable reference point for creating precise mechanisms.