customize rubber stamp base

I have problem with rubber stamp handle. too many size and sold in 1 pack 10 piece.
I want to keep minimum stock and keep only an oftten use.
I use cad program to design and use 3d printer to print base. It ok. But It a big program and design take 1 by 1.

I change from cad program to openscad. I create a little script. It can customize rubber stamp base in easy way.
1. There are 3 type : box, round, ellipse.
2. cuztomize size and dimeter( for round type ).