This tool helps you to find the center! 

(At least that of a board)☺

It can be used for a width of up to 96mm.

(If this is too small, simply make it bigger in the slicer) ;)

The hole size in the center is 2mm.

So ballpoint pens and other rollerball pens fit easily. The width is also ideal for pencils.

If you have any suggestions, please write me a comment :)

Or if you have ideas and don't know how to realize them, you can also contact me :)