This remix allows you to specify a tolerance between the hole and the nickel because it may just be a better way to set up your printer. I have a very cheap kinda low quality printer so I use/need lots of tolerance between parts that are intended to fit together. I might be able to adjust some parameters to make the nickel fit but I think it would be worse overall for other sizes and other requirements.You can use the customizer (or use your own openscad app) to adjust for different coins, like if you don't have nickels in your country, just look up the diameter and thickness of your coin in mm. Also you can select to tolerance you wish to support, use zero if you want. reasonable tolerances are probably anywhere from zero to 1 mm.