What type of die-cutting machine can cut shapes that I design?

Can you answer genesis’s question about Scrapbooking?:

I have never used a die-cut machine, but am interested in finding one that can precisely cut silhouettes for a children’s book I am working on. Does such a thing exist? All I seem to find in my research is that all these machines must use existing shapes. Is it possible to have the “shape” on my computer and send that info to the cutter to cut out?
Thanks for any help!

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