Adidas is releasing a sneaker in which the sole/insole (?) are printed based on the purchaser's foot measurements. The shoes are not cheap, $300 a pop, and in very limited release at the moment. I'll bet this technology will be successful. If it is, and as costs decrease, surely hardboot liners will become available using a similar process. AND THEN, can hardboot shells be far behind? I hope so! It will be a Godsend for people with problem feet and ankles!!
https://techcrunch.com/2018/01/18/adidas-joins-carbons-board-as-its-3d-printed-shoes-finally-drop/
BB