When creating these sculptural ornaments I first used the software blendr and geometry nodes to create the shape of my choice. I tried designing it as complex to test out the capabilities of the 3D printer and the strength it has to create such elements. 

I then exported the elements into orcaslicer making sure I make any needed modifications to the shape and it was then ready to print to the size I needed.

Creating the mould using silicone was my next approach. Creating a box surrounding the sculpture to then pour the silicone in.

Once the mould has been created I then either used resin or concrete or even both to create an entire new ornament.