My wife's Aunt has one of these which she has NEVER used. I am going to try and sell it for her, and thought it would be nice to have a manual for it. I found one for free (not as nice as a hardcopy or .pdf version, but even though scanned, it is still useful, and did I mention, FREE?) online at the URL below.
I suggested that you could find the Rainbow D3 manual by going to the website where I found it. It is there and O.K., just be careful printing, as there are NUMEROUS BLANK pages. ONLY print pages from 28-66 for the fewest wasted pages (though, you'll still have some).
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