Topics created by Robathome

1. Correct. Stop/3v3/gnd are a set of endstop connector pins, exactly the same as on the Duet.

2. Any of the 4 endstop inputs on the X4.

3. All heater and fan outputs are whatever voltage you feed to the Vin terminals. There are no flyback diodes on the heater and fan outputs, so if you connect a relay coil, brushed DC motor of other inductive load, you must add a flyback diode.

4. I haven't seen any filament tension sensors either. We'll consider adding a "beep until acknowledged" option to the M291 command.

4. Use M581 to set up a macro to execute when one of the input pins changes state. See https://duet3d.com/wiki/Using_servos_and_controlling_unused_I/O_pins for how to control output pins.

The higher feed rates are for loading and unloading filament. But I rarely use feed rates other than 5 and 100mm/sec. So I agree that most of the available speeds are not useful. What would you like to see instead?

Yes, that undervoltage event points the finger at a power issue. Is your mains supply unreliable? My best guess is that you had a power brownout and the voltage dropped enough to interrupt the write to the SD card, so that the SD card got in a mess. You might have seen the lights dim at the same time, although that is less likely if you have LED light bulbs.

Another possibility is that you have a loose connection in your power supply wiring. Check that the screws in the VIN terminal block of the Duet are tight.

For the future I may implement monitoring of the second power monitor input on the Duet WiFi, so that if the 5V power falls below 4.0V then the board is reset. and won't try to start until 4.2V has been reached.

See http://reprap.org/wiki/G-code#M570:_Configure_heater_fault_detection.