Inner diameter is about 180mm (outer about 190mm so it should fit for most common printers)

In the base is a space for a ballast weight (in my case small lead pellets from diving weights) which must be inserted while printing (13.1mm/ 44th layer) and is not later removable. In my case it added about 250g of added weight to 200g of natural weight of the model.

Printed with 10% infill and 4 perimeters for better strenght, “spiral hole” (or a hook if you want) I made with 100% concentric infill to avoid snapping. Only 5 points of contact is necessary for organic supports.