Screw Fit is a packing problem. Four colorful helical pieces need to be fitted inside a black nut. The nut has multiple threads with different speeds. Moreover, two are lefthanded and two righthanded. Each of the four colorful pieces slides through a different thread. The packing problem is designed to have a unique solution, but many near misses. Once the solver knows where to place the pieces, the next challenge is to slide them in together, using coordinated motion and a bit of dexterity.
This interesting puzzle has been 3D printed by designer Oskar van Deventer. The box and four screw pieces took 4 hours and 45 minutes to 3D print on a Dutchy 3D printer. 18 meter of 1.75-mm PLA filament was used to print it. The puzzle weights 52 gram.
Oskar van Deventer has created many different puzzles including his brand of Oskar Puzzles which are mechanical puzzles and objects that can only exist thanks to 3D printing technology. Since 1978, he has been creating hundreds of mechanical puzzles, making him one of the world's most prolific designers. Several of his innovative designs are commercially available.