The opening mechanism works and feels almost exactly like a real zippo. The spring for the latch can be replaced easily. The wheel is clicky and feels like striking a flint. The inside comes out when pressing on the little hole in the side of the case. Print the case separately without support, and on the side of the hinge, and print the rest of the internals with basic supports (10% density). I used petg, not sure how PLA works. Please watch assembly video to know what to sand and file, and how to assemble.
UPDATE: print at 75% scale, 100% infill, and 0.1mm layer height to get a fully functional micro zippo! Assembly is not any more difficult!
The author marked this model as their own original creation.