Another time need to truncate the result! :)
Maths node has not this function and i don't see how enter inside Maths node another thing than the presets! :(
As soon as I enter another thing it's remplaced by a preset!
PS What is "STL" it's for Print 3D or it's another thing ?

Section Infos
StlVolume
http://moiscript.weebly.com/infos.html#stlvolume