Κaryatid shelf

The Κaryatids are female figures that supported the architrave in the south porch of the Erechtheion in the Acropolis.

As for the model, I would suggest you use some kind of adhesive on the top surface to ensure the rigidness of the shelf. Also feel free to scale the model to the dimensions you prefer, the one in the print profile has a height of 110mm. 

There is also another 3MF file you can download if you wish to use a threaded insert instead of adhesive. There is a cylinder already centered on the top of the model, simply press mesh boolean → Difference → select the two bodies→ and then difference (the lower one). That 3MF file should have the same print settings as the print profile already uploaded.