Paddy that's a really interesting idea! I have no clue how a virtual pivot would work and how to realize it though.
@Hazer AFAIK extruder meant originally both the hotend (which extrudes the plastic) and the extruder motor. But yes paddy means the hotend.
The "problem" with the lisa effector platform (where the hotend is) is that the kinematics work in a way that the arms are attached and rotate around the center axis of the effector platform, only leaving a 2mm tube for the filament.
Probably the multi extruder proof of concept nicholas made is the better solution, even though it requires a more complex software kinematics and a faster controller. But the easier and the less joints the higher the precision.
@Hazer AFAIK extruder meant originally both the hotend (which extrudes the plastic) and the extruder motor. But yes paddy means the hotend.
The "problem" with the lisa effector platform (where the hotend is) is that the kinematics work in a way that the arms are attached and rotate around the center axis of the effector platform, only leaving a 2mm tube for the filament.
Probably the multi extruder proof of concept nicholas made is the better solution, even though it requires a more complex software kinematics and a faster controller. But the easier and the less joints the higher the precision.