We use the Ridecase system on Bromptons, because you can tilt the mount so that it stays flush with the fold. I bought the original mount on Shapeways and was unhappy with it due to the porosity of the material that made sliding the mount in and out difficult, marred by hiccups. However I thought that the porosity was inherent to the 3D printing. Are you getting around the porosity somehow? The surface of your mount appears to the eye nearly as uneven as that of the original one on Shapeways.