After reading these replies, I checked my benchies' heights using an odd method, but it seems logical enough. I don't have functional calipers, so what I did is I took 3 benchies from my MK3S (they look great, no errors there) and placed a glass sheet from a delta printer on top to define a plane at the height of a 3D Benchy:
https://photos.google.com/share/AF1QipMrmjvLZslnIE99tQ8AemXcAn1FABP5nRVXFnJq9KL96t-ZWOa-TmzHLPqFEBoXnQ/photo/AF1QipNotYOZJKBRIFohTvDiUGf1Yp45CrJaH7NV9_nf?key=YXN4bTNEVG8zVC1LaGZuTmhvMHBvNVRzd2U5anNR
Then I placed the benchies that show the artifact at the edge of the glass sheet and their heights matched the benchies from the MK3S:
https://photos.google.com/share/AF1QipMrmjvLZslnIE99tQ8AemXcAn1FABP5nRVXFnJq9KL96t-ZWOa-TmzHLPqFEBoXnQ/photo/AF1QipMXgk40WrmIWOj8URm7qpYYA09Ks_Im8JPIOFx0?key=YXN4bTNEVG8zVC1LaGZuTmhvMHBvNVRzd2U5anNR
So I think this artifact is the infamous Benchy Hull Line, and not the result of skipped layers.

Interesting. Thank you! I'm curious why the artifact doesn't show in gcode previews... You're right. With a collection of ~40 benchies already, I don't really need more, so it's no big deal.

Hello all,

I built a custom cartesian printer and I love it. It prints just as well as my Prusa i3 MK3S. So far I've only had one problem with it:

It can't print 3D Benchies. Every other file prints beautifully.

At a height roughly level with where the deck (the flat part at the back? I'm not a boat expert) starts, the layers seem shrunken in the xy plane. The surface "jumps" about 1mm back out to its normal position and the jolly torture test is fine from the artifact up. I though it was a problem with Prusaslicer but I imported the gcode into an online gcode visualizer and all seems fine. It's not filament, either, because 4 different benchies (same STL)I could easily be wrong, but through deductive reasoning it seems that my problem's root lies with the board, a Duet Maestro. This issue doesn't prevent my printer from running, but it's an odd situation and I'd like to fix it. Any and all help would be appreciated.

Here are some photos of the problem, as well as a photo of the machine with an artifact-free print.
https://photos.app.goo.gl/hwchEmW9vmWFe3TS6

Thanks!

Thank you! It looks like it works now.

Thank you for the quick response! After following your instructions I'm thinking that I told the RepRap Configurator Tool the wrong firmware (2.05 when the board is actually running 3).

Thanks!

Hello,

I'm having a problem with setting up a custom printer. I was trying to tune my hotend when I received this message:

I spent some time looking on this forum and the internet in general but I couldn't find a solution. Here's my config file, if it helps:

; Configuration file for Duet Maestro (firmware version 2.03)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Tue Mar 24 2020 13:00:32 GMT-0700 (Pacific Daylight Time)

; General preferences
G90                                                ; send absolute coordinates...
M83                                                ; ...but relative extruder moves
M550 P"Cube Mini"                                  ; set printer name
M918 P1 E-4 F2000000                               ; configure direct-connect display

; Network
M552 P192.168.1.14 S1                              ; enable network and acquire dynamic address via DHCP
M586 P0 S1                                         ; enable HTTP
M586 P1 S0                                         ; disable FTP
M586 P2 S0                                         ; disable Telnet

; Drives
M569 P0 S0                                         ; physical drive 0 goes backwards
M569 P1 S1                                         ; physical drive 1 goes forwards
M569 P2 S1                                         ; physical drive 2 goes forwards
M569 P3 S1                                         ; physical drive 3 goes forwards
M569 P4 S0                                         ; physical drive 4 goes backwards
M584 X0 Y1:4 Z2 E3                                 ; set drive mapping
M350 X16 Y16 Z16 E16 I1                            ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z4000.00 E420.00                 ; set steps per mm
M566 X900.00 Y900.00 Z12.00 E120.00                ; set maximum instantaneous speed changes (mm/min)
M203 X12000.00 Y12000.00 Z180.00 E1200.00          ; set maximum speeds (mm/min)
M201 X1000.00 Y1000.00 Z20.00 E250.00              ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I30                       ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                            ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1                                   ; set axis minima
M208 X100 Y100 Z100 S0                             ; set axis maxima

; Endstops
M574 Z0 S0                                         ; set active low and disabled endstops
M574 X1 Y2 S3                                      ; set endstops controlled by motor stall detection

; Z-Probe
M558 P0 H5 F120 T6000                              ; disable Z probe but set dive height, probe speed and travel speed
M557 X15:85 Y15:85 S10                             ; define mesh grid

; Heaters
M307 H0 B0 S1.00                                   ; disable bang-bang mode for the bed heater and set PWM limit
M305 P0 T100000 B4138 R2200                        ; set thermistor + ADC parameters for heater 0
M143 H0 S100                                       ; set temperature limit for heater 0 to 120C
M305 P1 T100000 B4725 C7.060000e-8 R2200           ; set thermistor + ADC parameters for heater 1
M143 H1 S280                                       ; set temperature limit for heater 1 to 280C

; Fans
M106 P0 S0 I0 F500 H1 T60                          ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P1 S0.5 I0 F500 H-1                           ; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off

; Tools
M563 P0 S"Hotend" D0 H1 F0:1                       ; 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

; Custom settings are not defined

; Miscellaneous
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
; T0                                                 ; select first tool

What should I do? Any help would be greatly appreciated. Thanks!