Originally, I had a sudden inspiration to make a round disc for my son who is learning calligraphy, which can be used to mark the position of the indentation on the rice paper used for calligraphy.
Suitable for beginners in calligraphy, it is an auxiliary positioning tool

I found that the spacing was hard to control, and suddenly I remembered that I could make it into a roller. By pushing it, I could get a whole row at once.

The specification selects the most commonly used 70mm diameter outer ring, and a positioning angle is set for a spacing of about 25mm

As long as you align the marks left by the first row, you can press out a neat second row

After two experimental improvements, the height of some rib lines was increased to ensure that the indentation was clear

The handle shaft uses an 8-deformation structure, which avoids the deformation of the round hole during printing. It can be directly inserted and is very tight, so there's no need for glue

Finally, we also included the original two-size