@ Douw - the settling was one of the problems (on long prints). Even without the settling of the pigment, the b9 resin by itself does not play well with the Form1. You get bumpy textured surfaces. It may be that something in the b9 resin reacts to the laser/heat in a negative way.
@Jesse - because it’s hard to make a resin that is liquid and solidifies using UV/Light without adding some nasty chemicals into it that don’t play well with heat and fire
@Kevin - completely agree with you on the melting part. I did a test on the b9 resin with a torch and that’s exactly what it does, it turns liquid and melts, then burns. The form1 resins, they bubble, get crusty, smoke and turn black and then into ash.