I posted a new design tonight for the YX80. Gives you 80 seeds per rotation of the wheel. YX is sized for arugula seeds. Increased hole size from 2.5mm to 2.6 mm.
It costs $3-4 a wheel on our printer. That is just for materials, not the cost of the printer or electricity to run it. The purpose of making these wheels was to get custom specs on the wheels to alter seed size, seed spacing. I imagine they can be printed at local makerspaces or commercial 3d print shops. I do not plan to duplicate any of the authentic Jang seeder wheels. I just want to create and share my customizations.