I loved the roller crocs and was really pleased with how well 3d printed PLA handled the impact of skating.

I started with Dat_carrot's footbed and removed the axel portion (note, the footprint isn't quite the same, but it's close enough). Then I flattened the toe and added a bit of lift on the heel.

Last I pulled some roller skate plates off of on old pair of Riedell R3's and used them to create matching mounting holes on the footbed.

Print the front and the back, then print a mirror image of them for the other foot. Glue the pieces together and let the glue dry before you attach the plate.