Think I figured it out, RichRap has a length of PTFE going from extruder exit to the hot end input. This should mean that the PLA has nowhere to go but into the hot end. I will try this later tonight. Thanks for the help Greg, I'll let you know how I get on.
The tube can be seen here: [4.bp.blogspot.com]
The tube can be seen here: [4.bp.blogspot.com]
