As a high volume practice that uses both Invisalign, Essix, and other clear aligners systems I have built a significant percentage of my practice around removable aligner therapy. I have found Digi3Dworks to be incredibly easy to work with. From the online ordering system to the ability to handle special requests, they have absolutely won my business for all of my 3D printing needs. Costs are very reasonable and they have the ability to digitally modify any model you send them, to in effect build your own custom aligner system. I now am harnessing cloud storage thanks to these folks, and are keeping a digital copy of each of the models that I have grown in case I need another model down the road. My patients are amazed by the quality of these models. They love to hold and touch them once we are done thermoforming on them. Best of all there prices are very affordable so I have been able to build the costs into my fee structures without upsetting any patients. Truly this is a win win for all parties involved.