Best posts made by Omiclette

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Thank you Phaedrux for your response. This is my master's degree project I am doing at school. In my labotary, students have studied the MIM process with very low viscosity feedstock since the past 8-10 years. I am the first student to try and print their custom feedstocks. I designed and fabricated this inverted delta printer to validate that it is possible to print such feedstocks. I think the school will buy the Desktop Metal Studio during summer, but I won't be able to use it before the end of my program.

The piston type extruder has not been used a lot for 3D printing metal paste, because you need to remove air almost completely from the feedstock prior to printing due to the compressibility of air. Once this is done, controlling the flow rate is much easier with a piston type extruder because the is no slippage possible as with filaments and screw extruder. Filaments are not the best solution because it limit the solid loading (the amount of metal powder compared to the binder). Desktop proposes a 6 mm rod, which is better than filaments, but from what I read, there is still some slippage (some articles say that they increased the flow multiplier up to 127% to reduce the interlayer voids, which means that there is slippage). If I increase my extruder flow rate to 127%, the part will be overfilled by a lot.

I am not saying that the piston type extruder is without problems. I had great success with bigger nozzles (0.8 mm), but I am still working on making better prints with the 0.4 mm nozzle. If you guys are interested, I might be able to show what I am able to acheive with this setup, I just need to confirm with my supervisor that it is okay to do so.

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Hello, I have a question about M581 external triggers. In the documentation it says that the firmware will not wait for queued moves to be completed before executing the macro.

In my config.g, I have the following external triggers defined :
M581 T2 U S1
M581 T3 V S1
M582 T2
M582 T3

Below is the macro trigger2.g
M25
G91
G1 E90 F1500

Below is the macro trigger3.g
M25
G91
G1 E-90 F1500

If I send a G1 E200 F1500 and press the trigger while the extruder is running the command (manually triggering the V axis endstop), the extruder doesn't immediately do the trigger3 which should reverse the extruder (E-90 move). The trigger is executed after the G1 E200 F1500 move is completed.

I tried replacing the M581 definition for T0 (emergency stop) and it acts immediately.

See below my complete config.g file (firmware 3.4b7)

; Configuration file for Duet 3 (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Fri Jun 25 2021 11:47:43 GMT-0400 (heure d’été de l’Est)

; General preferences
G90                                                 ; send absolute coordinates...
M83                                                 ; ...but relative extruder moves
M550 P"MEAM-HP V01"                                 ; set printer name
M665 R119.3 L195 B55 H362.5                          ; Set delta radius, diagonal rod length, printable radius and homed height ***Bras ball and socket***
;M665 R119.25 L215.87 B50 H328                        ; Set delta radius, diagonal rod length, printable radius and homed height ***Bras double magnétique, tooling ball***
;M665 R109.57 L215 B50 H305                         ; Set delta radius, diagonal rod length, printable radius and homed height ***Bras Igus, effector v4***
;M665 R132.07 L215.87 B50 H312                      ; Set delta radius, diagonal rod length, printable radius and homed height ***Bras double magnétique***
;M665 R129.65 L215 B50 H319                         ; Set delta radius, diagonal rod length, printable radius and homed height ***Bras Igus, effector v5***
;M665 R120.45 L190 B50 H323                         ; Set delta radius, diagonal rod length, printable radius and homed height ***Bras rotule rouge***
M666 X0 Y0 Z0                                       ; put your endstop adjustments here, or let auto calibration find them

; Network
M540 PBE:EF:DE:AD:FE:ED                             ; set custom MAC address
M552 P192.168.11.17 S1                              ; enable network and set IP address
M553 P255.255.255.0                                 ; set netmask
M554 P192.168.1.14                                  ; set gateway
M586 P0 S1                                          ; enable HTTP
M586 P1 S0                                          ; disable FTP
M586 P2 S0                                          ; disable Telnet

; Drives
M584 X0 Y1 Z2 E3:4
M584 U3
M584 V3
M569 P0.0 S1                                        ; physical drive 0.0 goes forwards
M569 P0.1 S1                                        ; physical drive 0.1 goes forwards
M569 P0.2 S1                                        ; physical drive 0.2 goes forwards
M569 P121.0 S1 R0 T2.7:2.7:2.7:2.7                              ; change enable polarity, active = disable driv
M569 P0.3 S1                                        ; physical drive 0.3 goes forwards
M584 X0.0 Y0.1 Z0.2 E121.0:0.3                     ; set drive mapping
M584 U121.0										; for piston extruder limit switch
M584 V121.0										; for piston extruder limit switch
;M584 P4     										;show 4 axis
M584 P3												;show 3 axis
M350 E1 I0                                          ; configure microstepping without interpolation
M350 X16 Y16 Z16 E16 I1                              ; configure microstepping with interpolation
M92 X200 Y200 Z200 U3192 V3192 E3192:60.00          ; set steps per mm
M566 X1200.00 Y1200.00 Z1200.00 U100 V100 E100.00:1200.00    ; set maximum instantaneous speed changes (mm/min)
M203 X18000.00 Y18000.00 Z18000.00 U6000 V6000 E6000.00:20000.00 ; set maximum speeds (mm/min)
M201 X2000.00 Y2000.00 Z2000.00 U200 V200 E200.00:1000.00    ; set accelerations (mm/s^2)
M906 X2000 Y2000 Z2000 U800 V800 E800:1680 I30                ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                             ; Set idle timeout

; Axis Limits
M208 Z-0.1 S1                                       ; set minimum Z
M208 U7475
; Endstops
M574 X2 S1 P"^io1.in"                               ; configure active-high endstop for high end on X via pin ^io1.in
M574 Y2 S1 P"^io2.in"                               ; configure active-high endstop for high end on Y via pin ^io2.in
M574 Z2 S1 P"^io0.in"                               ; configure active-high endstop for high end on Z via pin ^io0.in
M574 U1 S1 P"^io4.in"                               ; configure active-high endstop for high end on Z via pin ^io0.in
M574 V2 S1 P"^io3.in"                               ; configure active-high endstop for high end on Z via pin ^io0.in

; Z-Probe
M558 P0 H10 F120 T2400                              ; disable Z probe but set dive height, probe speed and travel speed
M557 R50 S20                                        ; define mesh grid

; Heaters
M308 S0 P"temp1" Y"thermistor" T109900 B4217 H0.0       ; Plateau chauffant___configure sensor 0 as thermistor via CS pin temp1
M950 H0 C"out1" T0                                  ; create chamber heater output on out1 and map it to sensor 0
M307 H0 B0 R0.598 C398.3 D0.66 S1.00 V23.4          ; enable bang-bang mode for the chamber heater and set PWM limit
M141 H0                                             ; map chamber to heater 0
M143 H0 S100                                        ; set temperature limit for heater 0 to 100C
M308 S1 P"spi.cs0" Y"thermocouple-max31856"         ; configure sensor 1 as thermocouple via CS pin spi.cs0
M950 H1 C"out2" T1                                  ; create nozzle heater output on out2 and map it to sensor 1
M307 H1 B0 R0.466 C354.7 D23.13 S1.00 V23.4         ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S100                                        ; set temperature limit for heater 1 to 100C
M308 S2 P"spi.cs1" Y"thermocouple-max31856"         ; configure sensor 2 as thermocouple via CS pin spi.cs1
M950 H2 C"out3" T2                                  ; create nozzle heater output on out3 and map it to sensor 2
M307 H2 B0 R2.044 C129.7 D5.81 S1.00 V23.4          ; disable bang-bang mode for heater  and set PWM limit
M143 H2 S100                                        ; set temperature limit for heater 2 to 100C
M308 S3 P"temp0" Y"thermistor" T109900 B3800 H0.0       ; Extrudeur___configure sensor 3 as thermistor on pin temp0
M950 H3 C"out0" T3                                  ; create bed heater output on out0 and map it to sensor 3
M307 H3 B0 R1.359 C207.4 D4.75 S1.00                                    ; enable PID mode for the bed heater and set PWM limit
M140 H3                                             ; map heated bed to heater 3
M143 H3 S100                                        ; set temperature limit for heater 3 to 100C
M308 S4 P"spi.cs2" Y"thermocouple-max31856"         ; configure sensor 2 as thermocouple via CS pin spi.cs1
M950 H4 C"out0" T4                                  ; create nozzle heater output on out2 and map it to sensor 1

; Fans
M950 F0 C"out4" Q500                                ; create fan 0 on pin out4 and set its frequency
M106 P0 S0 H-1                                      ; set fan 0 value. Thermostatic control is turned off

; Tools
M563 P0 S"Piston" D0 H1:2 F0                        ; 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
M563 P1 S"Melangeur" D1 H1:2                             ; define tool 1
G10 P1 X0 Y0 Z0                                     ; set tool 1 axis offsets
G10 P1 R0 S0                                        ; set initial tool 1 active and standby temperatures to 0C

; Custom settings are not defined
M581 T2 U S1 
M581 T3 V S1 
M582 T2
M582 T3
;M581 T0 U S1 
;M581 T0 V S1 
;M582 T0
;M582 T0
; Miscellaneous
T0                                                  ; select first tool