(I can't believe I never posted this video! TOO BUSY!)
Molds from Creative Paradise: https://www.creativeparadiseglass.com/
Creative Paradise PDF on fill weights: http://spuaf.axcqn.servertrust.com/v/vspfiles/tutorialsfornewweb/Fill%20Weights%20for%20CPI%20Frit%20Casting%20Molds.pdf
Firing schedule I used:
400-1100-45
50-1225-90
600-1520-30 (This was summer 2021... since then, I've found I can get a nice full fuse at much lower temp and shorter hold, about 1475 for 20 min. Less stress on the molds and the glass)
9999-900-180 (long anneal soak as they were somewhat thick and I had other unrelated projects in the kiln I was planning around as well)
100-600-0