Think i get it. Looks like a well thought out plan.

Quote Originally Posted by Mjolinor View Post
...At the hot end I had a stainless pipe with the nozzle on attached to the end of the PTFE tube and the actual hot bit had a hole that the nozzle fitted into so that changing colours involved removing one nozzle/ptfe pipe and replacing it with another one so that the extruder nozzle stayed in the same place.
I can see that automating the filament selection wheels would be relatively easy, but swapping the nozzle/ptfe pipe for each filament might be a little more mechanically involved.

From a programmer's point of view, i'd be more inclined to have a go at the software option. It's already set up to handle at least two extruders from the get go. How difficult would it be to extend that to 5 or 6?