Wanted to have a solid one-piece mirror spider to replace the flimsy stock one. This gave excellent results on a cold night with just PLA. With PLA CF it's more rigid and doesn't contract as much in cooler temperatures. (0.4 mm (PLA) vs 0.25 mm (PLA-CF) across its diameter from room temperature to -22C!)

My first design! Wanted a new front end for my telescope as the stock ones are flexible garbage and the CNC ones cost $$$.