Update 05/02/2025:
I've made a change that further highlights the millimeters, making it even more functional.

I created this simple yet effective tool to find the center of any cylinder, up to a maximum of 180Ø mm. Thanks to the external concavities, it allows you to use it without slipping. Additionally, I thought it would be useful to add a simple ruler.

I recommend reducing the speed of the first layer and applying a lacquer to the print bed to ensure the lines and numbers adhere well.

To have two colors, you need to change the filament at layer number 3.

Happy printing!