3 Piece Burr Puzzle

6,492

45

5

Introduction: 3 Piece Burr Puzzle

About: I like to design and build random things.

I made a 12 piece burr puzzle shown here a while back and my friends/family enjoyed playing with it. This smaller/simpler version has only 3 pieces and is similar in construction to Sythe101's shown here. In addition to the wood version shown, I've created STL and STP files for a version that can be printed. As it is close to Christmas, I decided this would make a nice ornament as well!

Step 1: Tools/Materials

Tools:

  • Table Saw
  • Router and Router Table or Table Saw
  • Ruler
  • Pencil
  • Sand paper
  • File

Materials:

  • Wood: 2.25" x .75" x 12" (12" allows for extra pieces)
  • Paint/Stain (optional)

Step 2: Drawings

You will be building to this drawing. The parts are color coded for reference.

Step 3: Part 1

Start by cutting a piece of wood to 2.25" wide by .75" thick. For the notches, you could use a table saw with a dado blade or multiple passes with a standard blade. I chose to use my router table for this step. I passed a large piece of wood (~10" long) through and then went back and cut the pieces to length (.75"). I repeated the process on the second cut. However, since the pieces where smaller, I used scrap wood on both sides of the workpiece for stability.

You only need two of these. I made extras to allow for trial and error when fitting together.

Step 4: Part 2

This piece is similar to Part 1 except the center section is rounded. I started with one of the Part 1 pieces and rounded the corners. This was tedious and wasn't very nice looking in the end. I eventually broke the piece when trying to assemble the puzzle. The second version is shown here. For this one, I cut the blocks to .75" cubes and then glued a .375" diameter dowel between the blocks. This looks much nicer but I'm not sure how long it would hold up with kids.

Step 5: Part 3

Part 3 is similar to the other parts except that notches are cut into both sides. Again, I used the router table for these cuts.

Step 6: Finished Parts

Once built, you might need to do sanding to work out the fit. You want the puzzle together snugly. Once sanded, I finished the parts with Danish Oil.

Step 7: Solution

The solution isn't intuitive. However, the round piece (Part 2) should give you a hint about the solution.

  • Step 1: Insert Part 2 into Part 3 as shown. Note rotation.
  • Step 2: Insert Part 1 into the slot on Part 3 as shown
  • Step 3: Rotate Part 2 to center the puzzle

Solution Video:

Step 8: Assembled Pictures

I'm actually happy with how it turned out. With more care, I think I could have made the fit a little tighter.

Step 9: 3D Print

The parts are essentially the same except that I added rounded corners the outer edges. They serve no purpose except to make it feel nicer in your hand.

Step 10: 3D Print Files

Along with the STL files, I've included STP files for those that would like to modify the design.

Step 11: 3D Print Part Pictures

I'm not sure I would have picked this color but that's what was loaded on the printer at the time.

Step 12: 3D Print - Assembled

I was very satisfied with how it printed. It's a balancing act between interference and being too loose. My print didn't require it but you might need to do a slight amount of sanding to adjust the fit. Below is a video of it being solved.

Step 13: Puzzle Comparison

Wood vs. print.

Thanks for viewing.

Step 14: Tis the Season

Ok, last pictures. I drilled a hole in one of the pieces to make a Christmas ornament. Maybe I will forget how to solve it by next Christmas.

Step 15: Final Thoughts

If made from wood, the puzzle takes time and requires tight dimensions for a proper fit. If I ever decide to build another, I think I will scale it up to double the size. Besides being an easier build, I think it would be more durable. The 3D print worked fine as expected. The one change I would make is to print in 3 different colors.

As always, thanks for viewing!

Holiday Decor

Participated in the
Holiday Decor

Be the First to Share

    Recommendations

    • Puzzles Speed Challenge

      Puzzles Speed Challenge
    • Secret Compartment Challenge

      Secret Compartment Challenge
    • Lighting Challenge

      Lighting Challenge

    5 Discussions

    0
    mtairymd
    mtairymd

    10 months ago

    Sorry...I missed your comment. Yes, you need to round the piece in order to rotate it. You can do it with a file but it will take a while.

    0
    vis5isve
    vis5isve

    Question 1 year ago

    none of the pieces in my puzzle have blunt edges, how am I supposed to go through the first step?

    0
    mtairymd
    mtairymd

    Answer 1 year ago

    I’m not sure what you are asking. The parts should be built to the dimensions shown.

    0
    vis5isve
    vis5isve

    Reply 1 year ago

    GREAT NEWS! I DID IT!

    Turns out the piece from Step 4: Part 2 needed a little more force (I may have used my teeth) to rotate since the edges aren't rounded.

    Thank you very much! I don't know why I'm telling you this but I had to tell someone.

    Yes, the first two pieces are the same in case you were wondering - because that surprised me

    WhatsApp Image 2019-07-10 at 9.55.34 PM.jpeg
    0
    vis5isve
    vis5isve

    Reply 1 year ago

    In Step 4: Part 2 you said "This piece is similar to Part 1 except the center section is rounded." The piece I own doesn't have a rounded centre, does that mean that it is impossible to solve?

    The piece only rotates about 45 degrees (and it is the only piece I can rotate)

    I apologize for taking your time. Thank you!

    WhatsApp Image 2019-07-10 at 9.20.20 PM-2.jpegWhatsApp Image 2019-07-10 at 9.20.20 PM.jpeg