Check honesysticks stuff. Also I am able to heat my rosin for a few hours at low temp (under 250f) and i put it in disposable carts with syringe and works pretty good. may need a slighly more powerful battery like 8w or so or whatever those disposable carts can handle. my liberty haze that was really terpy did really well in the carts because it was mor viscous than my other oil. nugsmasher has a tutorial on making carts from rosin. hash rosin should work a little better but my flwoer rosin smokes fine. not the biggest clouds in the world, but i like it it taste more like actual flower than all the added terps im used to in carts.