Say you want to fill redstone energy cells, put an interface with the crafting pattern onto a chest saying empty energy cell plus "x" redstone = full energy cell(can't remember how many are needed)
Extract from the chest, put the redstone into a magma crucible and the empty energy cell into a fluid transposer, set the magma crucible to output to the transposer and voila...
That's how to do it on demand, my preferred setup is an export bus into a magma crucible which then fills a tank which then drains into the transposer. This keeps a buffer of liquid at all times for faster crafting. See pic in spoiler:
There's an interface behind the Fluid transposers that has patterns for Tesseracts etc, import bus at the bottom pulls the completed craft back into the AE system