Despite his strong inclination to defer on-line halachic questions to local halachic authorities, Rabbi Without A Cause (RWAC) graciously agreed to answer Sephardi Lady's question about the need to tovel (ritually immerse) my homemade cookie cutter:
Thanks for your email.
I generally tell people to ask their local authorities, because I'm a big believer in the idea that local rabbis should determine local practice.
That said, from my point of view there is no need to tovel this cookie cutter, assuming a Jew made it. The steps you outline qualify as creating an implement from scratch, and an implement created by a Jew does not need tevilah.
Thank you so much, RWAC!
One of my daughters is home sick today, so we just might make another batch of camel cookies, just in case the pending hurricane hits Boston. (Why do Emergency Preparedness Supply Lists always forget to list cookies?)