This prints in less than 30 minutes. It folds over the lantern handles and can be screwed together with a 3mm x 6mm long screw. Threads are one half and through hole on the other.

I also have another model that converts the lantern to 18650 lithium cell with micro-USB charger. HFT Luminar Outdoor Popup Lantern 18650 battery & charger modification by JEO | Download free STL model | Printables.com