Simple wooden 3D puzzle plan

Here you can download a plan for making a wooden 3D puzzle. In the picture above you can see what the puzzle looks like, and in the picture below there are drawings to help you create the parts.
 
Simple wooden 3D puzzle plan
 
 
The puzzle consists of only two different parts (Part 1 and Part 2).
 
Simple wooden 3D puzzle - Part 1
 
Simple wooden 3D puzzle - Part 2
 
 

OUR SOLUTION - 7 pieces of part 1 and 5 pieces of part 2:

Part 1 should be made in 7 pieces and part 2 in 5 pieces.
 
Both parts can be visually divided into unit cubes measuring 19 x 19 x 19mm. Part 1 consists of 11 unit cubes and part two of 7 unit cubes. If you look at the assembled cube  in our picture of the puzzle, you will see that it consists of 5 x 5 x 5 = 125 unit cubes. 
 
7 pieces of part 1 has 7 * 11 = 77 unit cubes
5 pieces of part 2 has 5 * 7 = 35 unit cubes
making a total of 77 + 35 = 112 unit cubes 
 
From this it can be concluded that if you want to put together (our solution) a cube measuring 5 x 5 x 5 unit cubes, within the puzzle there will be an empty space measuring 125-112 = 13 unit cubes. 
 
Simple wooden 3D puzzle - Solution
 
 
Parts 1 and 2 can be made of different types of wood to create contrasting appearance. If you like challenges try to find another solution (if exist) or create more pieces and try to assemble a puzzle of larger size (6 x 6 x 6, 7 x 7 x 7 ...).