Makerbot Z18 install

ReelLife

Hello!
I am Currently upgrading a MakerBot Z18 replicator I bought a duet 2 wifi board and I am having some issues with the Z axis. its a Core XY printer, It has one motor running the Z-axis and I believe the problem has to do with what appears to be gear ratio that's about a 1:6. smaller gear on the stepper. so when I put in the Z to 450 it only goes about a 6th of the way. If i set it to 2700 it goes just about all of the way down but as it is only 450 mm I'm assuming this will mess up my prints. does anyone have any ideas? I'm spending way too much time on this LOL.

fcwilt

@reellife

Are you talking about the M92 steps-per-mm setting?

Frederick

ReelLife

@fcwilt
Im talking total build volume I messed with the steps per mm and it did not fix the problem.
the printer is 350 x350 x450 the X and Y work perfectly but the Z is all messed up If I move it down it will just stop like it hit an invisible end stop at about a 1/6th of the way down.

the steps per mm is at 400 Rn

fcwilt

@reellife

Post your configuration files (all of them) using the </>.

You select the tag from the toolbar and it creates a place holder piece of text "undefined".

Copy and paste each file over the text "undefined".

You likely have a M208 setting wrong.

Frederick

ReelLife

@fcwilt
Thanks for your help I'm new to the scene. im not sure what you meant by </> but I attached my files as best I could.

</>tpre0.g tpost0.g tfree0.g stop.g sleep.g resume.g pause.g homez.g homey.g homex.g homeall.g Duet2CombinedFirmware.bin config.json config.g bed.g

ReelLife

@fcwilt I Meant 305 for the x y and 457 is the true z setting according to the original build volume. I believe it will be more like 350 after I finish mounting the heated bed

fcwilt

@reellife

OK when you click on the </> in the toolbar you get this:

undefined

Then you copy and paste your code, replacing the "undefined" bit.

Then you get this:

; some of my code
; some more of my code
; gosh I have a lot of code

So here is your config.g file pasted over the "undefined" bit:

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Tue Jul 20 2021 14:15:47 GMT-0500 (Central Daylight Time)

; General preferences
G90                                            ; send absolute coordinates...
M83                                            ; ...but relative extruder moves
M550 P"My Printer"                             ; set printer name
M669 K1                                        ; select CoreXY mode

; Network
M552 S1                                        ; enable network
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 S1                                     ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3                               ; set drive mapping
M350 X16 Y16 Z16 E16 I1                        ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E420.00              ; set steps per mm
M566 X900.00 Y900.00 Z60.00 E120.00            ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00        ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z200.00 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 X305 Y305 Z457 S0                         ; set axis maxima

; Endstops
M574 X1 S1 P"xstop"                            ; configure active-high endstop for low end on X via pin xstop
M574 Y1 S1 P"ystop"                            ; configure active-high endstop for low end on Y via pin ystop
M574 Z1 S1 P"zstop"                            ; configure active-high endstop for low end on Z via pin zstop

; Z-Probe
M558 P0 H5 F120 T6000                          ; disable Z probe but set dive height, probe speed and travel speed
M557 X15:215 Y15:195 S20                       ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                          ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B1 S1.00                               ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0                                        ; map heated bed to heater 0
M143 H0 S120                                   ; set temperature limit for heater 0 to 120C
M308 S1 P"e0temp" Y"thermistor" T100000 B4138  ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1                           ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00                               ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S280                                   ; set temperature limit for heater 1 to 280C

; Fans
M950 F0 C"fan0" Q500                           ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1                                 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                           ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45                              ; set fan 1 value. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 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

; Custom settings are not defined

; Miscellaneous
M575 P1 S1 B57600                              ; enable support for PanelDue

fcwilt

@fcwilt

Now as to the M208 setting of steps-per-mm.

The goal is to have the correct value that gives you the correct amount of motion.

So starting with your 400 steps-per-mm for Z:

first issue a G90 command
then issue a G1 Z10 command
make some kind of mark on the frame even with the tip of the nozzle so you can measure from this position
now issue a G1 Z110 command
make some kind of mark on the frame even with the tip of the nozzle so you can measure to this position
now measure from the first mark to the second mark.

If you measured 100 mm then the steps-per-mm is just right.
If it was greater than 100 mm then the steps-per-mm is too large.
if it was less than 100 mm then the steps-per-mm is too small.

Let's say you measure 50 mm (just to keep things simple). That tells us that the steps-per-mm is too small.

Multiply the current steps-per-mm setting by 100/50 (what-it-should-be / what-it-measured).

Enter this value into the M92 command and re-boot.

Now repeat the process above until you find just the right value for steps-per-mm to move exactly 100 mm.

Frederick

ReelLife

@fcwilt
I had to leave the lab that the printer is in but I will check this out in the morning

according to my code the M208 command is the axis limits and M92 is the steps per mm

ReelLife

@reellife
Is that correct or am I just reading somthing wrong?
My understanding is if I entered that into the M208 it would change axis limits not the steps per mm

fcwilt

@reellife said in Makerbot Z18 install:

@fcwilt
I had to leave the lab that the printer is in but I will check this out in the morning

according to my code the M208 command is the axis limits and M92 is the steps per mm

I'm sorry - I was in a hurry - my wife called that dinner was ready - you are correct - it is M92.

Frederick

ReelLife

@fcwilt
Thank you very much! It ended up being just over 2600 so I was way off.
I appreciate your time!

fcwilt

@reellife

Regards 2400 - that likely means your lead screw pitch is 8mm per rev, your stepper motor is 1.8 degree and your gear ratio is 1:6.

Glad to have been of help.

Frederick