Your printer has to be able to print smooth 1st and 2nd layers.
Glue the parts together with plastic glue, hot glue, or superglue. If throwing, hold the glider between the wings and tail. If launching, make sure you hand is out of the way. If the glider is veering toward one direction all the time, check if the tail is bent.
Get the full instructions at https://www.thingiverse.com/thing:31944
The user re-uploaded this model. The user is not the original author of the model.