i’ve built a five-axis-printer based on the K8800, for my university. The fourth and fifth axis are uncoupled from the xyz-movement, so i can still use the original hardware and marlin firmware of the printer for now. Now i have two questions:
In the product description video (‘Vertex Delta 3D Printer’ on youtube.com at 2:25) a printhead angle detection is mentioned, that halts the printer in case someone bumps into it. For my purpose i have to deactivate this safety feature, how can i do that?
The printhead has a small backlash in z direction due to the Dynamixel motors i use. This causes some problems with the automatic calibration. When the nozzle touches the bed during the height calibration, sometimes the piezoelectric sensors don’t realize it because of the backlash. I’ve already set the sensitivity to the maximum with the potentiometer, but it’s not enough. Is there an option to increase the sensitivity beyond the maximum? Maybe by replacing the potentiometer with a larger resistor or an external circuit?