The fused deposition modeling (FDM) method produces parts that are plenty strong as well. We use both SLS and FDM machines at work, and while the resolution is better on the SLS machine, our FDM parts are generally stronger (though we do have a good range of stout materials to pick from). Just have to make sure that the part is oriented properly on the print bed, as the FDM parts are much more susceptible to delamination than SLS. Gotta be careful, as the material is isotropic but the structure is not.
This is a great idea, btw. Methinks I might be making a mount for my phone, pending el Jeffe's approval.