I really liked the style of the dragon done here https://www.thingiverse.com/thing:570345 by muzz64 and thought I would try my hand at making it flexi with both wings attaching with only pressure. The wings attached for me great and are very hard to take back out. I'm sure results will vary dependent on how well printers are setup.(I have some elephant foot on my prints which may be helping the fit). Try one wing and if it is too loose try printing at 101%.