I tried improving my previous design, it should glide better, and it's also a bit smaller in wingspan to better fit the print bed
**USE 0.16mm LAYER HEIGHT** The wings are only a single layer thin, if you experience problems with the initial layer (tearing, bubbling...) make sure your bed is as level as possible (glass bed would be ideal) and also try decreasing the filament flow for the initial layer (I myself had to go as low as 70%).
Once printed, use something like a piece of tape at the center of mass of the glider to make it easier to throw (as seen on second picture). I also advise to at least slightly coat the vertical fin in super glue to prevent it from snapping (don't use too much otherwise you'll throw it off-balance).
The glider was tested only using a single printer and single PLA filament type. Your results may vary widely from mine.