@Phaedrux Thanks for that. After search for parts it looks like it's going to be easier for me (I'm In NZ) to source a MOSFET as opposed to an SSR (based on this thread, I assume a MOSFET would work as well?).

Reading the Duet3D wiring and sifting through the forum, this is what I currently understand that I should do:

1/ Connect the ATX PSU +12V to the Duet VIN, and PSU GND to D3D GND
2/ Connect the D3D BED- and D3D BED VIN to the MOSFET control
3/ Connect the MOSFET DC+ to PSU +12V and DC- to PSU GND
4/ Connect the Heatbed +/- to the Mosfet +/-
5/ Connect the D3D EXT_5V +5V to the PSU +5V and the D3D PS_ON to the PSU PS_ON so that the Duet can power up the PSU on demand

I'm not sure I got that 100%, in particular what I should do with the Duet EXT_5V GND. I would really appreciate some feedback on what to do there. Thanks!

Hi there! I have a Duet3D V2 WiFi board powering a heavily modded Atom 3D Printer V1, and have recently gotten a heatbed (silicone 12V 200W).

Now, you will probably all laugh at me, I connected the heatbed and its thermistor to the corresponding pints on the Duet3D, but then obviously there was not enough current for the heat bed, as I was using the Atom stock PSU (12V 8A).

Looking at the Duet manual, it seems that an ATX PSU would be an easy-ish option, so I went for one that should work in theory (12V up to 37.5A/450W).

Now, I'm really rusty in electronics, but it seems that the Duet board being rated for 18A, I should be able to plug the Duet to the ATX PSU 12V+ and Ground, and then have the 12V 200W head bed feed off the Duet heat bed power pins.

However, Perplexity.ai recommends against doing so, and says that I should either use a 24V heater bed, or connect the heater bed directly to the PSU. The Duet3D manual also mentions a 15A fuse, which seems like it may be a problem given the 200W heat bed.

Having to connect the Duet3D and the heat bed separately to the PSU sounds a bit complicated, but given that I already have the heat bed, I may need to go down that route.

Could someone with experience confirm how I should set this up? I'll need a bit of handholding for understand what should be wire to what, but I'm happy to document the process in the forum so that it can help others as well.

Thanks!

Thanks for pointing this out, however I'd like to know where it is precisely so that I'm sure that I won't be interfering with it -- I hope it would be indicated on one of the diagrams. I can't look at my board right now, but hopefully it is written there.

Hi there,

This is probably a silly question, but I haven't been able to locate where the sensor/electronics for the Smart Effector z-probe are. I'm trying to mount the smart effector on top of the Atom 3D Printer effector platform, and wanted to make sure the platform doesn't get in the way of anything important below the Smart Effector.

I couldn't find anything in the documentatation, and was also curious to know how that specific z-probe works.

Thanks!

Replying to myself here, but basically the wiring was OK and that I thought there was a problem because the movement was too brief. I was using G1 S2 X1, but using a higher value such as G1 S2 X10 makes the movement more visible.

The main thing that made me think there was an issue is that the motor produce a sound after a G1 S2 command even when they're not moving, while I thought they would power off after the movement is complete. Issuing a M1 command does stop the noise from the motors.

@dc42 Thanks for the quick reply! Here is the M906 output

Motor current (mA) - X:1000, Y:1000, Z:1000, E:800:800, idle factor 30%

This is probably the problem -- I have no idea which values I should enter. I tried your spreadsheet but did not see where I could input the values in the RepRap FW configurator. As you've probably guessed I'm quite new to such a level of configuration.

@Stephen6309 not yet, my multimeter ran out of batteries but the motors were working fine with the stock Atom board, so I assume they're wired properly on the motor end.

Here's the config.g, as generated by the RepRap FW configurator:

; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2 on Fri May 17 2019 08:06:27 GMT-0400 (Eastern Daylight Time)

; General preferences
G90                                         ; Send absolute coordinates...
M83                                         ; ...but relative extruder moves
M665 R105.6 L215 B85 H250                   ; Set delta radius, diagonal rod length, printable radius and homed height
M666 X0 Y0 Z0                               ; Put your endstop adjustments here, or let auto calibration find them

; Network
M550 P"XXX"                                 ; Set machine name
M551 P"XXX"                                 ; Set password
M552 S1                                     ; Enable network
M587 S"XXX" P"XXX"                          ; Configure access point. You can delete this line once connected
M586 P0 S1                                  ; Enable HTTP
M586 P1 S0                                  ; Disable FTP
M586 P2 S0                                  ; Disable Telnet

; Drives
M569 P0 S1                                  ; Physical drive 0 goes forwards
M569 P1 S1                                  ; Physical drive 1 goes forwards
M569 P2 S1                                  ; Physical drive 2 goes forwards
M569 P3 S0                                  ; Physical drive 3 goes backwards
M350 X16 Y16 Z16 E16 I1                     ; Configure microstepping with interpolation
M92 X80.00 Y80.00 Z80.00 E663.00            ; Set steps per mm
M566 X1200.00 Y1200.00 Z1200.00 E1200.00    ; Set maximum instantaneous speed changes (mm/min)
M203 X18000.00 Y18000.00 Z18000.00 E1200.00 ; Set maximum speeds (mm/min)
M201 X1000.00 Y1000.00 Z1000.00 E1000.00    ; Set accelerations (mm/s^2)
M906 X1000.00 Y1000.00 Z1000.00 E800.00 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30                                     ; Set idle timeout

; Axis Limits
M208 Z0 S1                                  ; Set minimum Z

; Endstops
M574 X2 Y2 Z2 S1                            ; Set active high endstops

; Z-Probe
M558 P4 H5 F120 T6000                       ; Set Z probe type to switch and the dive height + speeds
M558 H30                                    ;*** Remove this line after delta calibration has been done and new delta parameters have been saved
G31 P500 X0 Y0 Z2.5                         ; Set Z probe trigger value, offset and trigger height
M557 R85 S20                                ; Define mesh grid

; Heaters
M140 H-1                                    ; Disable heated bed
M305 P1 T100000 B4138 R4700                 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280                                ; Set temperature limit for heater 1 to 280C

; Fans
M106 P0 S0 I0 F500 H T45                    ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P1 S1 I0 F500 H1 T45                   ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools
M563 P0 D0 H1                               ; Define tool 0
G10 P0 X0 Y0 Z0                             ; Set tool 0 axis offsets
G10 P0 R0 S0                                ; Set initial tool 0 active and standby temperatures to 0C

; Automatic saving after power loss is not enabled

; Custom settings are not configured

Hi all,

I'm in the process of converting an Atom 2.0 delta 3D printer to using Duet and am stuck at the stepper motors. The motors are MinebaMitsumi 17PM-KA39B with the following specs:

I've followed the instructions, but that did not work out because the motors were not homed (even with the M564 S0 H0 sequence).

Instead, I've tried the following:

G91 ; relative mode
G1 S2 X1 ; move the X carriage up 1mm

and I do hear a sound coming from the motor, but there is no movement whatsoever. Is there some specific configuration that I need to do? The wiring seems good as well:

Any advice would be much appreciated!