I mainly made the following sections.
It was set as follows.
I couldn't open the DXF file downloaded from this site with illustrator directly .So I opened it with Inkscape and converted it to SVG file.
And then, I edited the shaft hole design to fit tightly in the shaft of stepper motor with illustrator.
I deisgned a body with Fusion 360.
The internal design is as follows.
I assembled all the parts and attached a stepper motor.
I designed electronic circuit and wrrote program that the rack gear goes up and return to the origin. I used Aruduino UNO and the following devices.
I wrote the program as follow.
Finally, another member integrated this program into the machine program.
We made a prototype with cardboard priviously. Next, I modified some parts and designed data for MDF.
The friction of the shaft part was large, and a lot of load was generated when the motor was in operation. So I attached the bearing to make rotation smoother.
In order to prevent the side wall of the box from spreading, I attached the box clips.