I am printing with ZUltrat some parts that needs to be precisely glued. I always read to use super glue but some weeks ago i tried to use the raft from previous printings, cut them in pieces and added acetone in a bottle to make a very thick creamy paste.
This glue really fuses both pieces to get glued, fill in the gaps with the same color of the print, it is super easy to handle (the opposite of superglue), it is easy to clean up and finally it is for free.
Some bonds are stiffer than the print itself.
I guess it is possible to do the same with any filament that would dissolve in some solvent.