Custom Case Insert - part 1 (Took Way too long)
I made a custom insert right above the USB-c port. I want to make this interchangeable, so I can swap designs in and out, whenever.
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There were way too many problems making it:

1 - Made Border sketch on wrong surface. When switching from the bottom to top of a part, the entire sketch rotates, and gets misaligned. Solved by Remaking Sketch using USE. (10 mins spent)
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2 - Switched to wrong plane for making the insert. It would have been easier to extrude down and then use Boolean. I switched to the front plane, after already making sketches for the top plane. Solved by switching back to a save that had the top plane sketches through version history. (30 mins spent)
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3 - Forgot that computers make mistakes. When I Used the Boolean tool to make the insert from the extruded hole, I found that the shape wasn’t entirely parallel where it was suppose to be. I spent about an hour (felt like) rechecking all my measurements. When i asked gemini (out of ideas), I realized it was probably a float error. I didn’t think that Onshape would suffer from the same problems as my really unoptimized python code. (30 mins spent)
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Sorry if I am ranting. I hate float errors