On a whim I checked on the S3D web page "Is my printer compatible" if the Craftbot Plus is supported by S3D (I knew it was, I just wanted to know if there was an official profile), and got the "Hooray" response.
However, when I go to the "Configuration assistant" (under Help) in Simplify3D (v3.1.0), the printer does not appear in that list. Is this a known issue? Doesn't S3D properly download profiles from their servers?