Swedish based company SkyMaker AB recently launched their web based 3D-platform SkyMaker Studio for product generators. It uses WebGL to enable working with 3D-models directly in most modern browsers including iPads since the iOs8 release. No installs required!
The platform can easily be modified and branded for most product owning companies which shortens the way from customer to custom designed product. There are also a few free product generators that are aimed towards DIY manufacturing with 3D-printers. One example is creation of custom assortment boxes. Once you have access to your first 3D-printer you should never have to buy another assortment box again.