This is a small piece to check the calibration of you printer using a 1-Euro coin as a reference.
- Diameter: 23.25 mm
- Height at edge: 2.33 mm
A tolerance of 0.2 mm has been added in the design to both the inner diameter and the height.
- Inner diameter should fit a €1 coin.
- Distance between the middle bars is the same as the coin height.
- Middle bars height and width are the same as the coin height.
- Total height is the same as two €1 coins stacked together.
I have added another version with a small ring on the top, so you can attach a keychain and it would make a good 3D giveaway for your friends.