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Wednesday, April 23, 2025

New Puzzle Comes Out – Smelling Of Roses

Smelling Of Roses by Steve Nicholls
I’m lucky to have many friends like myself in the warped-mind community.  In an effort to appear as regular people, some have attempted to come close by becoming regular tetrahedron people.  This has resulted in several tetrahedron puzzle designs popping up of late and this is the story of one such great pyramid puzzle.

Smelling Of Roses was developed by that famous guy from Two Brass Monkeys, Steve Nicholls.  Not to be confused with that other famous guy from Two Brass Monkeys that designed Rock-It Burr that we gushed over in a previous post (Drill Baby Drill! – Rock-it Burr).  Smelling Of Roses is made using …  well that depends on what you use to make it.  Steve made the design available on Maker World for anyone to download and make their own copy.  My version is 3D printed using a single color of PLA.  Not for any aesthetic reason but simply because I was too lazy to change the filament for additional colors.

Smelling of Roses takes a typical 6 piece burr and transmogrifies it using tetrahedronagonyal geometry.  This is basically a process of weaponizing the pieces by providing many pointy bits.  It also has the advantage of making the pieces difficult to grip since they are no longer rectangular and squeezing them tighter just launches them from you fingers instead of securing them.

Smelling Of Roses Pointy Bits
Thorny Problem!
You would think that having 4 obvious corners would make the piece placement a no-brainer. However, there were several times I was considering putting those obvious corners in some not so obvious places.  Although, I didn’t think it possible, the pieces support going together in many unhelpful ways.  It took me several tries to find the correct assembly and when I finally had it, it was an effort to figure out how to move the pieces to get them all in place without loosing track of the assembly.  All this while juggling the pieces and attempting not to launch them.

Steve did an excellent job in picking a 6-piece burr that requires multiple moves before any pieces can be removed.  No key piece requiring a single move here!  In fact the movements are nicely executed in the tetrahedral space that the pieces were developed in.  I have to give Steve a lot of credit for using the BurrTools tetrahedral-octahedral space grid.  I find it very unintuitive to use.

The copy of Smelling Of Roses that I printed is a bit tight (the description uses the friendlier term - snug).  When all the pieces are coming together, they have to be cajoled into position.  It also adds a level of difficulty during disassembly since the moves are not obvious and nothing moves with casual prodding.  You have to prod with intent.  And multi-piece movements require more intent than single piece movements.

This is an awesome take on the 6-piece burr puzzle and kudos to Steve for making it freely available to the community on Maker World!  So download Smelling Of Roses and give it a try.  But whatever you do, don’t leave this caltrop of a puzzle sitting on a chair!  Assuming that you can put it together of course.

5 comments:

  1. Steve sent me a BurrTools file of the puzzle which uses the cubes grid. The reason for this is it can show the disassembly, but the pieces look really weird!

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    1. I saw that one as well. Steve had posted it on the MPD.

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  2. Thanks for the very nice write up. I've subsequently added a second print profile to the model with slightly looser tolerances. As George mentions I ended up using both the cubic and tetra-octahedral grids, the former for analysis and the latter for generation of the STL's.

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    1. Thanks again for sharing the design and the update! I've only seen the BurrTools file for the cubic space but I would imagine that both took a big effort to get working. I find it interesting how the movements seem to be non-Cartesian since they don't align with the surface of the tetrahedron.

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    2. It took a little effort - it became easier/possible when Penrose put out the video explaining how the design works. Until then I'd not appreciated the movements didn't align either. The main effort was filtering out designs with unintended rotations. There were a few apparantly high level solutions that turned out to be "trivial", fall apart disassemblies. Having printed and binned many failed attempts I now have a better appreciation about what causes the problems. I may re-visit the anaylsis at some point with some refinement to see if I can find a higher level, stable design. Higher level is easy, stable less so.

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