This the classic bird-in-tree puzzle. I built one of these out of wood (cedar) many years ago and decided to try to reproduce it in PLA using a 3d printer. I included a photograph of the original.
FLSUN Pursa RepRap i3 CPlus
0.2 mm with 0.4 mm nozzle
I printed the stl files at 80% in the z-direction to save time. The stl files included are full size and will print 50 mm thick puzzle pieces, if not reduced.
Very little post printing is required for this model. Just clean the glue from the back of each puzzle piece and minimal cleanup of any stray filament strands.
Step 1 - Convert photo to jpg file
Since I had an old wooden version of this puzzle, I used it to develop a digital drawing of the original puzzle that I could convert into an stl file for printing. To create the digital line drawing of the actual puzzle, I first photographed the cedar version of the puzzle and used ImageJ graphics software to convert the photograph to a line drawing. The line drawing took some work to eliminate additional lines from the grain structure from the converted photograph of the cedar wood version of the puzzle, but it was relatively straight forward. I saved the line drawing of the entire bird-in-tree puzzle as a jpg file.
Step 2 - Select puzzle pieces and convert each to an svg file
Once I had a reasonable line drawing of the entire puzzle, I used ImageJ to outline and select an individual puzzle piece. I then deleted all the other parts of the puzzle drawing, leaving only the one selected puzzle piece that I saved as a separate jpeg file. I then used an on-line converter (https://image.online-convert.com/convert-to-svg) to convert the jpg file to svg format. I repeated this process for each piece of the puzzle.
Step 3 - Convert svg file to stl file
Once you have an svg file, you can import the file as a sketch into 123d Design or similar software package. In 123d Design, you select the sketch and use the extrusion feature to convert the sketch to a solid object. Now that you have a solid object, you can save it as an stl file for subsequent printing.