Subject: Follow up

Hi [first-name],

This is [your-name]. We’re part of the [your-business-name] and I was just following up with you on your interest in 3-D printing. If you could give me a call back at [your-phone-number] at your earliest, and I also did send you an email. I am on the on the 24th yesterday and that has my contact info as well. So hope to hear from you [first-name].

Have a great day.