Printed alumilan coupler inserts because I wanted something to fill the 6 alumilan couplers I had with something to make them work.
Not recommended to use these with high stress spring loads. Not really sure how much abuse these can take compared to the aluminum version, even if lower overall. High infill and perimeters are recommended. Inpact resistant filament recommended. The holes must be drilled with a 3/16 drill bit.
Measurements directly taken off of http://captainslug.com/nerf/Cheek%20010218_C.pdf Remix of https://www.thingiverse.com/thing:3365494, because Bingiberse Bis Borke.