Hello,
as you probably know SLA is already being used for shoe production:
Formlabs
Carbon & Adidas
The advantage of SLS is that you can print without supports, the powders are more expensive though and the surface is not as smooth as with SLA. And the Fuse1 isn’t available yet while the Form3 is.
Why do you want a Form3L? Do you plan to print shoes for very big feet?