Pragmatic Puzzle Box v2

by gruppler, published

Pragmatic Puzzle Box v2 by gruppler Apr 9, 2015
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This is a puzzle box that requires a spin to unlock. The mechanism that locks the lid in place is itself locked by four 6mm BBs, which can be printed in place, or placed during the print.

A simple spin on a reasonably level surface allows the lid to be twisted 20 degrees, which allows the lid to be removed. However, closing and locking the box does not require any tricks; simply insert the lid and twist it to lock.


Note: If you want to test the locking mechanism and tolerance before committing to a full print, you can print the included test models.

  1. Print the top.
  2. Get four 6mm airsoft BBs ready.
    Note: You can also print a version of the bottom that includes the BBs. Just insert the lid and twist it closed like normal, and the BBs should break free. Be warned, sometimes BBs don't print well for me.
  3. Start printing the short or tall version of the bottom.
  4. If necessary, insert the four BBs when their chambers are printed but before they're closed off.

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I scaled it down to 80, I wouldn't recommend doing so. I've broke 4 diff lids just trying to get it to function properly. I'm going to print another at 100 see if that works better.

I scaled it down to 80, I wouldn't recommend doing so. I've broke 4 diff lids just trying to get it to function properly. I'm going to print another at 100 see if that works better.

Comments deleted.

I print the test with BBs and it worked great! I was going to print the cube model with BBs but one of the BBs (lower left corner when I open it in S3D) is flagging as non-manifold. Upon closer inspection, there is clearly a few surfaces missing. In the sliced view one of the BBs is obviously misshappen when compared to the other 3.


Good catch! I uploaded the corrections to the affected files.

Thanks! I'm starting a print now!

I printed one at 0.2mm (0.4mm nozzle) and it came out perfect. Lovely print. The mechanism is smart and works as intended.

I used the model with 3d printed balls/BBs/bearings so I did not need to insert the balls myself.

Great! I'm curious how the printed BBs turned out. I couldn't get them to print well.

The BBS are round and nice. I took a look at them mid-print.