Dear Hiring Manager,
I would be glad to write full 3D printing articles for you! As someone who has worked with manufacturing 3D printers and created produts for retail sale using 3D printing, I would take the time to craft good articles. I am available immediately, and have written profusely in the past.
I am very interested in doing this project for you. PLease notify me if you would like me to begin writing.
Regards,
Aviv