A couple years ago the doorknob to my room broke and I decided to design my own from scratch. I used Tinkercad which is a very simplified CAD software. Using a higher level software such as SolidWorks would have made this much easier, but I was not experienced in CAD yet.
I used a cam
And I obviously chose to make it Star Wars themed
My Aunt printed the text for me on her vinyl cutter and I spent hours placing each of the letters onto my box
Recently, my mom's microwave broke and I took it all apart to diagnose it. I eventually discovered that the high voltage capacitor was not working properly and I ended up replacing it. Instead of spending hundreds of dollars on a new microwave, I fixed the old one with a $10 part.