Please look to this side
... special materials.
from my view it is perfect for melting out. And casting brass. No residue
ca. 250 degrees Celsius - time depends on volume.
the minimum quantity is 3kg.
I don't know how they handle there rules with an university.
they are in Asia - and have a Europe center in Nederlands.
And a center in US (I think NY)...
This material you can perfect glue with alcohol 98%. In my case I do not need support-material - complex parts I print in 1,2,3 parts and glue them to one complete piece. The material is hard- you can use sandpapers und so on...
as you can see on the pict: to complete a castingtree you can also use a soldiering iron.