I made this one using black PLA. After printing, I sanded the puzzle using different sand-papers and gave it a quick spray-paint to improve the colour. Then, I cut stickers for it by hand which was a very tedious task. I printed it without any cut pieces. After all, this is a great addition to my Square-1 collection. In my opinion it is very easy to solve but maybe that's because i only used "full" corners. Thank you for contributing this puzzle!