I'm curious, what "molecular biology" services do you offer?
DNA construction:You need a custom DNA sequence? You send me the sequence you want and preferably a template DNA (if the sequence is over 250bp), and I use PCR to create or edit an existing sequence, and I clone it into an expression vector of your choice (which you may have to provide if I don't have access to it). I would even consider generating viral particles carrying the DNA, but there are legal/ethical limitations as to the tropism of said virus.
Could you make me some ecoli/another bacteria that would produce testosterone as long as I kept feeding it and then I could sell it to my body building friends?!
Molecular biology is fun. I took a break from my studying and did a year in a lab doing PCR, cell culture and putting things into viruses and cells and watching them work! I really enjoyed it. Your service may not be the most popular one using bitcoins though unless you start offering illegal virus modification!
How much would you charge for your 3D printing service? Do you print in one colour? Can colours be added later? Do you just need a 3D model? Do you charge a different amount for different sizes? Postage to UK?
Thanks! And good luck getting someone to buy your DNA sequences.