I created this model to keep a pocket door from getting stuck and misaligned. 

I designed to have a base that fits under the door and attaches to the floor with pocketed screw holes. I positioned it so that whether the door is fully open or closed it's always in contact with the guide but tried to keep it out of the doorway as much as possible so it doesn't get stepped on. 

I initially printed this with Overture PLA with 15% infill and an Octet infill pattern in Cura for testing. I planned on printing a version with 100% infill and would probably recommend that for part strength but mine hasn't broken yet so I haven't replaced it.