This new storage module is designed to hold a 30 cm metal ruler. The internal slot measures 330mm x 2.5mm x 25mm, so it fits snugly while keeping the ruler easy to access.

This model is fully compatible with the Grifinity modular system and takes up 8 x 0.5 units on the grid, with a height of 6 units. So two of these could fit on a single column. For example this Gridfinity Rule Holder

Since it's a bit too long for a single print on the Bambu Lab A1, I added a dovetail joint to split it into two parts. In my first try, one of the feet did not glue correctly to the body, so I aware you to print it slowly in order to prevent this.