Really interesting way to make fdm watertight and stronger
https://www.youtube.com/watch?v=nRLJ...ature=youtu.be
Basically pack in salt and heat in oven.
Unlike annealing - because the part is almost gas tight, there is very little dimensional loss.
Also because you are packing it in fine salt - essnetially you are creating a 'lost wax' mould making method - but keeping the wax.
Essentially you are producing a one shot injection moulded part.
Ingenious :-)
Plus salt is cheap and almost completely inert.
Very clever bit of thinking.
I will be trying this at some point.
Actualy watertight vases !
Now that's something you can actually sell.