Sowing Roll for Seeder

Sowing roll for Terradonis precision Seeder.
As I own a Terradonis precision seeder and a sowing roll with 8 holes does not exist, I drew this one and print it out instead of buying a blank sowing roll and to have to drilling it.
Number of holes : 8
Depth of the hole ↓ : 1 mm
Hole width ↔ : 4 mm