I think the answer is yes: they are at the Heathkit AR-3, Altair-1 stage, where anyone can do it.

>I wonder if 3D printing is about to tip. I just finished reading "Makers" by Cory Doctorow, looks like he was about 3 years ahead of his time: http://www.amazon.com/Makers-Cory-Doctorow/dp/B004IK9ECI/ref=la_B001I9RSKC_1_5?ie=UTF8&qid=1343760243&sr=1-5
>
>>Funny, I was thinking about a similar topic last night. Yvonne, who does the Lianja video tutorials, does the best job I've ever seen. She makes everything look easy (it's easy, but she makes it look really, really easy). I figured she could put together a 3 minute tutorial on constructing your own nuclear reactor for home power and it would work. <s> The key, though, might be having a printer capable of making the parts.
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>>>>http://www.theregister.co.uk/2012/07/30/3d_printed_assault_rifle/
>>>
>>>wonder when small grade neutron bomb drafts will be availabe -
>>>buy plastic and printer, add heavy elements and some initial explosion trigger stuff...