Another Predator

boldnuts

@Carlo can we see your start gcode from your slicer?, you using G32 (calibrate) before printing?, maybe G29 S1 to load the bed mesh?

Carlo

@boldnuts
I have no start code yet having failed to get a layer down yet didn't want to add any complications,
However I have been doing G92 Z0 with paper G32 before attempting aprint ..I never home after probe and always with heated bed and nozzle, bed @ 70c nozzle @ 220c.
I have done the mesh but don't use it .. more to know it's flat..ish I think?? height maps are above in previous post.

If that help ?

Thanks

boldnuts

You need to run G32 in your start gcode before every print and it might be a good idea to run G29 to load the bed mesh as well, then recall it with G29 S1

Danal

@boldnuts said in Another Predator:

You need to run G32 in your start gcode before every print

YES!

This is one of the big keys to running a delta. Let it find the bed, every time.

Carlo

@boldnuts

I'll try the mesh I do G32 before every print attempt.
dc42 commented a well built delta doesn't need bed mesh so not wanted to ..because I want a well built delta printer

Thanks

Carlo

@Danal @boldnuts
This is the height map it just finished ...is it ok?

Thanks

Danal

Yes, that's great. Very flat. RMS error .027.

You can probably skip mesh, if you wish. I would still run a simple probe before every print to set bed height. They run very quickly, in the grand scheme of things.

Here's my bed.g (invoked by G32 in slicer startup code). Note: The M106 commands turn off (and back on) the hotend fan. Mine vibrates enough to cause false triggers. It doesn't hurt for it to be off for the one minute or so all the probes take.

Build one for you here http://escher3d.com/pages/wizards/wizardbed.php The big key is to do a 6 or 8 factor, so as not to adjust diagonal rod length. (Do NOT do a 7 or 9, at least not before every print). More info here: https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer#Section_Setting_up_the_bed_g_file

; bed.g file for RepRapFirmware, generated by Escher3D calculator
; 16 points, 8 factors, probing radius: 280, probe offset (0, 0)
G28
M106 P1 S0
G30 P0 X0.00 Y280.00 Z-99999 H0
G30 P1 X140.00 Y242.49 Z-99999 H0
G30 P2 X242.49 Y140.00 Z-99999 H0
G30 P3 X280.00 Y0.00 Z-99999 H0
G30 P4 X242.49 Y-140.00 Z-99999 H0
G30 P5 X140.00 Y-242.49 Z-99999 H0
G30 P6 X0.00 Y-280.00 Z-99999 H0
G30 P7 X-140.00 Y-242.49 Z-99999 H0
G30 P8 X-242.49 Y-140.00 Z-99999 H0
G30 P9 X-280.00 Y-0.00 Z-99999 H0
G30 P10 X-242.49 Y140.00 Z-99999 H0
G30 P11 X-140.00 Y242.49 Z-99999 H0
G30 P12 X0.00 Y140.00 Z-99999 H0
G30 P13 X121.24 Y-70.00 Z-99999 H0
G30 P14 X-121.24 Y-70.00 Z-99999 H0
G30 P15 X0 Y0 Z-99999 S8
G29 S1
M106 P1 S1 I0 F500 H1 T40

Carlo

@Danal

I need to try something as mesh didn't work...Did probe then ran mesh then ran probe then invoked G29 S1 and loaded the print file and,

latest failure.jpg

I'll play with the probe G31 Z height a little I guess ? ...changed the print file got sick of the other one.
Also I've just redone my bed file I'll try that first before making any other changes
Thanks

droftarts

@Carlo Any reason you didn't baby step down 0.1 or 0.2mm or so? After all this, that would tell you if it's just a probe height problem.

Ian

Danal

How does the effector actually probe?

Example: The smart effector flexes the circuit board just slightly when the nozzle presses on something, and a strain gauge reads this to trigger the probe output. The strain gauge is a long "spiral" (spiral triangle) of very thin circuit traces that surround the mounting point of the hot end. Because of all of this, the Z offset for a smart effector probe is often right at -0.1

What does your hotend do? Piezo? Slight movement? Etc. What offsets have you used?

Carlo

This post is deleted!

Carlo

@Danal
Hi Danal,

It's a smart effector I've tried loads of heights and all with the same results fine in parts of the bed too high in others
currently at -0.08 trigger height.

Thanks

Carlo

@Danal

Just thinking ..first for me! is it possible as the only thing that dictates the height is the nozzle touching the bed and the end stops is this simply an end stop issue I read somewhere on these forums about a faulty optical end stop some delay in it's signal which meant false height, given the height map is flat the smart effector is working but only in the space it thinks its in, I'm claiming all is built fine but are they.. nothing else has any influence on the height? and the effects never change no matter what I change in settings or technique .
I've ordered the replacements already but if someone can say nope your wrong that would suck but I'll have learned a little more.

Cheers

Danal

If you are running a G28 G32 (which invokes bed.g) before every print, then endstop accuracy is much less important.

Two scenarios:

One, the printer homes (g28) and prints. In this case, the ONLY determinant of bed-to-nozzle spacing for the first layer is the accuracy of the home switches (and proper configuration of overall Z height).

Two, the printer homes (g28), then probes (g32), then prints. In this case, the G32 is the final arbiter of bed-to-nozzle spacing for the first layer. (and proper configuration of Z probe offset).

So, yeah, you probably did not need new endstops. IF you are doing a G32 before EVERY print.

Carlo

@Danal

I am doing G32 before every attempt.
Ah well just a thought ...about the only thing I have not changed.

Cheers

droftarts

@Carlo your bed.g should have M561 or G29 S2 at the beginning, otherwise it’s probing will be affected by any bed mesh you have loaded.

Ian

Carlo

@droftarts

I always make sure mesh is disabled as per delta cal docs when probing I'm gonna fit the new endstops and try again because nothing is making any difference, appreciate everybody helping at least I have a better understanding of reprap though if I don't get this to work not sure I'll remember it.

Thanks
C`

Carlo

Hi,

Does anyone know if I can send the board and effector back to Duet to be tested ?

Thanks

NexxCat

Not sure if it will be any help, but my full Duet2Wifi config for my predator is here:
https://github.com/nexx/Anycubic-Predator-Duet

It certainly looks like you're too far away from the bed.

On the github, you'll also find the macro's I use, including one I run prior to every first print since power-on.

I'll try and help further when I can, but hopefully this helps for now. The current github is for RRF, but if you go backwards in the history, my RRF2 config is there too.

Carlo

@NexxCat

Thanks NexxCat I started with yours and Jay_uks and your carriage adaptors Thank you for posting them.

It isn't to far away the effector is being lifted away I've tried baby stepping but it just digs up whats been printed honestly after 4 weeks constant not sure there is any combination I have not tried and I'm really not exaggerating
So today the machine is over 6mm shorter than this afternoon according to the calibration?