Unmatch Box

Unmatch Box

Unmatch Box is shaped like a matchbox, but is a combination of two linked rings. The goal is to pack the three pieces in the box. The volume of 2x3x4 is more than sufficient to accommodate all the pieces. The problem is very little room between the linked rings for the pieces to enter, once one or more pieces are in.

Updates

2025/12/07: added 2 variants of the broken up box piece. The original one is very hard to print properly. The 2 new version fix that problem in 2 different ways

Printing Instructions

Print one of each piece (attention, there are 3 versions of "part 2" only one needs to be printed). After assemble 2 rings of the box as seen on the picture. Glue the joint of the inner ring and you are all ready for puzzling.

Some slicer / 3d-printers seem to have problems with the small hooks that close the ring. The hook is not connected to the ring. The important setting here seems to be “wall generation” or “perimeter generator”. This must be set to “Arachne” and not to "Classic". If all else fails, just scale up all pieces until the hook is properly generated.

Difficulty

3 out of 5

The Printable Puzzle Project

The Printable Puzzle Project aims to make available high-quality open-source models of many puzzle designs. All of our models are posted with the generous permission of their designers and are licensed for **non-commercial** use only. Anyone may print copies for their own personal use, but selling or otherwise monetizing them is not permitted, and puzzle designers retain all rights as copyright holders of their work.

Our puzzles are modeled using the open-source puzzlecad library. The .scad file is included with this model in case you want to modify any of its design parameters; more information on how to do this can be found in the PPP Puzzle Modeling tutorial.

The "No Problem Puzzle Collection" contains many puzzles with complicated boxes that would be too hard to model using open-scad. Additionally the original design files for the boxes have been lost due to a hd-fault. That is why these puzzles only contain scad-files for the pieces.

About The Designers

From November 2020 to April 2023 Theo Geerinck and Symen Hovinga collaborated under the trading name of "No Problem Puzzles" to design and produce their puzzles. Many of their unique packing puzzles introduce fascinating features such as moving or sliding doors and elements. These features and the way they behave always add a playful new dimension to the more familiar exercise of packing shapes. Those puzzles could once be purchased through an online printing service. Alternatively, for those who owned a 3D printer the files could be obtained from Symen.

However, after the tragic loss of Symen, purchases through the ‘No Problem Shop’ was no longer possible. Therefore, Theo decided to publish the designs so that everybody can create 3d-printed copies to be enjoyed for personal use.