R2 Key 2

So I made an r2d2 model that you can add a keyboard key switch to and use his head as the keycap but no matter what I've tried I don't know how to scale it right in Blender so I haven't been able to print it because Cura always gives each part some crazy scaled up size and it's different for each part. So I gave up on it. The pin holes for the parts are supposed to be the size of 1.75 mm filaments so that the raw filament can be used as the pins. But again I'm dumb and wasted hours and even days trying. I've hit my limit with it. If someone could help me fix it I would love you forever.