[Chris] has been having some real problems getting PLA to stick to the build platform ... This is a technique the we use with our own 3D printer. The sheets of paper are used as a mask to help ...

The result is a bit like a plus-sized 3D-printing pen, but much simpler and capable of much heavier extrusion. But it wasn’t quite as simple as shoving scrap PLA into a hot glue gun and mashing ...