Print-It-Yourself Puzzles

Currently Playing: Kombi - Who can make a clean metal version of this?

Print it yourself at https://oskarvandeventer.nl/Print-It-Yourself/. Buy at https://puzzleguy.store/products/kombi-four-ring-combination-lock Read more at https://twistypuzzles.com/forum/viewtopic.php?t=40543 Kombi is a four-ring combination lock. Each ring has ten segments, numbered 0-9. The segments have different size. The goal of the puzzle is to take apart into 40 dovetailed pieces. When the two rings are properly aligned, using the secret code 1638, then the gaps between the numbered pieces align at two places, and one half can be slid from the other half. After that, everything can be taken apart easily. The puzzle is based on the prime numbers 2x3x5x7, using a angular grid with 360/(2x3x5x7) degrees spacing. The gaps at the first ring are at multiples of 360/(2x3x5) degrees apart. The second 360/(2x3x7), the third 350/(2x5x7), and the fourth 360/(3x5x7). This assures that when four gaps align at one place, there can not be any aligned four gaps elsewhere. This rule is violated at one point with an aligned gap that is exactly midway between two grid angles. This assures a unique solution, as well as many near misses where two or three rings align. Copyright (c) 2025, M. Oskar van Deventer. Frequently Asked Question: http://oskarvandeventer.nl/FAQ.html Buy mass-produced Oskar puzzles at https://www.puzzlemaster.ca/browse/inventors/oskar/ (USA, CA) and https://www.sloyd.fi/brain-teasers/inventors-designers/oskar-van-deventer (EU) Buy exclusive 3D-printed Oskar puzzles at https://i.materialise.com/shop/designer/oskarpuzzle, https://www.chewiescustompuzzles.com/puzzleshop/oskars-puzzles