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Key chain Knot Cross Puzzle, OCC, Three Pieces, Kong Ming Lock

3D model description

Key chain Knot Cross Puzzle, OCC, 15mm x 25 mm x 5mm

The small cross knot puzzle turned out to be appealing for kids. They wanted a key chain for it. Why not? So I made two versions with two levels of tolerance. It makes a great toy as well as an interesting learning object for 3D design.

You could also change the slicing resolution to adjust the tolerance between the pieces. Have fun!

3D printing settings


.1 to .2mm



Clean up a bit when necessary.

  • 3D model format: STL


STEAM educator, learning from and working with K-12 STEAM teachers to explore new ideas of teaching and engagement. I firmly believe ART is at the core of STEM learning or all human learning! I owe my ideas and designs to the hundreds of K-12 children and teachers and university professors I have had the pleasure of working with, in multiple disciplines-- math, science,engineering language arts, social studies, early childhood education and more! All mistakes, of course, are mine! There is no warranty or liability whatsoever implied or explicit behind the designs or ideas. They are all posted for their potential educational values.

When working with children, please strictly observe all safety and health procedures! Please refer to the NSTA safety guides:




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