I suspect someone will find a 3D printing application for this. Could be great for assembling separate parts.
http://www.popularmechanics.com/technology/design/a25572/ikea-made-their-furniture-as-easy-to-setup-as-a-jigsaw-puzzle/?src=nl&mag=pop&list=nl_pnl_news&date=030817
If I hadn’t already seen you commenting in some other threads I’d think this was spam. 
@ThantiK I am an Ikea fan, but honestly think this could be applied to 3D-printed connectors. Something like a tablet stand that could be carried flat in your suitcase… join the neck of a 3D-printed guitar to the body… RC aircraft wings connected to the fuselage… quadcopter arms… etc.
If you can find an example on a non-commercial site, let me know and I’ll gladly change the link.
No no – just, bounding through the endless hordes of spam we actually receive. It looked a lot like spam at first glance. The text included was enough for me to catch it. 
I appreciate your work in keeping things on track!