2 Kinematics / 1 Printer - filament arm
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@IndeX4D I didn't follow this thread completely, so my understanding may be wrong.
If I understand correctly, you have some kinematics and want to build a separate kinematics to follow the hotend. So two independent kinematics, which are connected by the position information.
The robot kinematics creates one chain of connected actuators, so they are not independent. You will not be able to decouple them, because there is one input and one output of the chain. You need one input and this input split into two outputs.
The source to the code is mentioned on the page you mentioned above about configuration of the robot, 4th text line, github...
I am myself very interested in multi-kinematics, I wrote a thread in https://reprap.org/forum/read.php?185,824669 a long time ago, but currently my primary interest is finishing the robot kinematics.