This 3D Knot Puzzle is one of the things my grandfather used to make back in his woodworking days. I know it from the German crafts-shop “OpiTec”, who sold it as a DIY-Kit. (Also known as the “Devil's knot”)

Using their provided dimensions, i remade the individual pieces in Fusion360.

The 3MF-File is scaled to 50% (80mm long), and includes print settings for Prusa MINI with PLA.

The Fusion360 file is based on user parameters. Feel free to change them to your liking:

OpiTec shop link:

https://www.opitec.de/werkpackungen/holzbausaetze-/spiele--/opitec-knoten.html

PDF link:

https://nbg-web01.opitec.com/img/104/065/104065bd.pdf