Hi there! My name is Mahmoud, and I am an experienced Mechatronics Engineer with a Master's degree in Mechanical Engineering from Munchen University of Germany. I have 40 journal papers and 22 international conference papers to my name, as well as a lot of experience in Automotive, Aerospace, Electronics, Micro Electromechanical Systems, Energy conversion, Robotics and Automation.
I understand that you need an STL file designed for a stepped 65mm diameter spacer that needs a 30mm diameter step with a 5mm thick side and an 8mm thick center hole. I can confidently say that my expertise makes me the perfect fit for this project. With over 20 years of experience in mechanical tools design (including Solidworks), mold design (including PCB layout), animation and motion design (Flow), FEA analysis (CFD analysis), G-Coding (CAM programming) as well as sheet metal works, I am confident that I can produce the file you are looking for.