1x9 lego technic rack

Hey! this is my first make so I'm not super confident on how it works, Haha.

I recommend doing this at high quality (16mm, slow speed)
anyways, this part is a mid-version between the two Lego sizes of gear racks. if you'd like to edit this you can, at:
https://www.tinkercad.com/things/3nM0afSSHOk