Support grayscale printing

https://discord.com/channels/1300546654323347547/1300546654323347550/1487501148075196566

<img width="209" height="452" alt="Image" src="https://github.com/user-attachments/assets/638b018d-11ef-4b29-a038-703a75222de9" />

<img width="254" height="452" alt="Image" src="https://github.com/user-attachments/assets/f39ede13-1c3b-4759-bff5-b04541b2ec24" />