What, you mean people who want to build their own 3d printer?
Yes they are available in kit form already. But there are opportunities for entrepreneurs with a 3D printer to offer a mail order printing service, after files are uploaded to the mystical cloud (a pc in the corner of a warehouse under a tarpaulin).
Subscription software is in the pipeline, where you pay a reasonable monthly usage fee and sign in or out as you need to.
Photoshop offer monthly subscriptions. My mate who is a semi-pro wedding photographer at the weekends gets it on subscription for a month or two, as he cannot justify the high cost perpetual licence.
Also ArtCAM has some clever code to turn a suitable photo into a realistic low relief for printing/carving (aka additive/subtractive manufacture).