Disclaimer: this is definitely not the best / easiest to print headset holder around. This was more of an excuse for me to experiment with dovetail joints running along an arc. You're probably better off searching for generic SKÅDIS headset holders instead.

Push the holder into the base's dovetail joint. You might need decent force against a solid surface to get the 2 parts to line up. Insert the universal hook in the stem, and install on the SKÅDIS board.
The author remixed this model.
Turned into a SKÅDIS compatible thing.