Another very nice board burr type puzzle designed by Donald Osselaer and published at http://puzzlewillbeplayed.com/12BoardBurr/Faraday/3/
Converted to STL files using Burr Tools including a 0.1 mm offset for tolerance - the .xmpuzzle file is included in the download folder.
Print four of each piece, making 12 pieces in total. Use a different colour for each piece as shown in the link above. I used Galaxy Blue, Raspberry Spark and Bling Bling Gold from Faberdashery.
3D printed at 0.25 mm resolution with 20% infill.
Test the fit of your pieces after printing the first set. If the tolerance is too tight or too loose you can re-export from Burr Tools using a different offset value.