Personally, i would use a 3-D printer, but you can use any material that you have, and have an example next to you for reference if you aren't going to 3-D print.
no longer returns an error but your math seems to have something wrong with it, always returns 0
Console.WriteLine("Enter a percentage here");
int Percent = int.Parse(Console.ReadLine());
Console.WriteLine("Enter your number here");
int Number = int.Parse(Console.ReadLine());
int result = Percent / 100 * Number;
1234567898765432123456789876543212345678987654321
A workstation used at an engineering firm.