Four Triangular Prisms by Daniel Kwan
Number of units: Four prisms of different colors. Each prism is made of three 2 × 1 pieces and six 1 × 1 pieces.
Designer: Daniel Kwan
Part I — Part II — Part III — Part IV.
The model is very sturdy. Assembling the last the units of every prism was a little challenging. I modified the folds slightly for easier fitting. Daniel Kwan has published Diagrams and Notes for other models designed by him. You may visit his Flickr collections of Tessellations and Modular Origami models for some excellent pictures! You may also want to check out the article How To Make Intersecting Wireframe Models.