> Testing usually doesn't come cheap, but you also might be able to drop by a well equipped Chem department at a university for testing as well
I don't think it's that easy. Even if you successfully synthesize the right chemical, you also have to get dosage and delivery right (consistently!).
From the OP:
> In response, Four Thieves published the instructions for a DIY epipen online that can be made for $30 in off-the-shelf parts and reloaded for $3.
If I had to depend on an epipen to save my life, I don't think I'd want a DIY version that may not work when I need it (e.g. mechanism fails, storage stability issues, dosage issues, etc.). Sure I guess it's better than nothing, but it's also proof this clearly isn't the solution to the $600 epipen problem.
> Shkreli drove the price of the lifesaving HIV medicine Daraprim sells up to $750 per pill. So Four Thieves developed an open source portable chemistry lab that allows anyone to manufacture their own Daraprim for just 25 cents apiece.
The article calls Daraprim and "HIV medicine" throughout, but isn't that misleading? I thought it was an anti-parasitic (that may be used by HIV patients to treat secondary infections).