My first attempt as spincasting was a complete disaster. It produced no parts and made a big mess. I may not have had the two plates clamp together had enough. I also neglected to put the cross-pins into two of the parts. So the entirety of my pour leaks out and onto the area around the drillpress.
So my first set of blasters is likely to be made through individual pouring of mold cavities instead of spincasting.
The only positive accomplishment is that I threw together a pressure pot out of some junk laying around at work. I can use it to make individual casts that are bubble-free.