About this 3D model

Edit: This thing has been driving a 50 sheet punch for thousands of students for over a year now! I honestly cannot believe how well this held up. I'm wondering why the original one broke..... Our Swingline 350 MD main drive gear had a few teeth sheared off (see pictures) and the parts are now out of production. 3D printing to the rescue! To my amazement, this 100% infill PLA printed gear has now been in service for close to 6 months being used by hundreds of university students to punch large stacks of engineering homework and is still going strong. This was a prototype, and to be honest, I didn't think it would actually work, especially for 6 months.