Bramswap

This CAD model was designed by Oskar van Deventer, copyright (c), 25 November 2024.

Bramswap is a failed attempt to design a hyper-exponential puzzle. The mathematical concept was proposed by Bram Cohen and mechanically implemented by me. Bramswap has seven numbered tiles. The object is to get the tiles sorted from 1234567 to 7654321. The puzzle has two sliders, one "ascending" and one "descending". Two tiles can only be swapped when the tiles below them are in ascending order (for the even slots) or in descending order (for the odd slots). The sliders enforce the ordering with little triangular pins that slide down on the sides of the tiles. They block whenever the ordering is violated. A locking pin in the base assures that only one of the two sliders can be active at any time.

It is conjectured that the puzzle is exponential with a base smaller than 2. However, further analysis is needed to confirm this.

The puzzle uses cylindrical magnets withe 3-mm diameter and 2-mm thickness: https://www.supermagnete.de/eng/disc-magnets-neodymium/disc-magnet-3mm-2mm_S-03-02-N
The puzzle also uses cube magnets with 0f 5x5x5-mm: https://www.supermagnete.de/eng/cube-magnets-neodymium/cube-magnet-5mm_W-05-N

Here are some links about this design.
https://www.youtube.com/watch?v=iwgjy4Ndb9M
https://i.materialise.com/en/shop/item/bramswap
https://i.materialise.com/forum/t/bramswap-by-oskar-bram/3864
https://twistypuzzles.com/forum/viewtopic.php?t=40100

Feel free to 3D-print an extra sample to give to a friend, as long as you mention the designer and don't charge money.

If you are planning to sell some samples, then please contact me for a license agreement. The royalty fee is 10% of your selling price.

Please do not upload the design to a commercial service, or redistribute the design in any way other than linking to the YouTube video: https://www.youtube.com/watch?v=iwgjy4Ndb9M

Enjoy!

Oskar
29 March 2025

Contact: 
https://oskarvandeventer.nl/index_contact.php?subject=Print%20It%20Yourself
