Hi Everybody, thank you for the suggestions and sharing your experiences.

what I learned is to say bye bye to my BLtouch (i will recycle it on my ender 3 )

I designed new bed support to place piezo (Precision piezo kit Ø20mm):

...and problably i will move to a new print head solution to prevent tilt issues:

i will design a special cooler to proceed with my liquid cooling idea and create a compact effector...

hope you like it and i'm on the right way now.. thanks guys!

I just understood what i've done, I opened the editor by the button on System folder:

i was thinking it was the actual configuration, but it's the first Json config i've made, probably the mistake come from there...

sorry if i gave you some wrong info

Thank you dc42, I thought it depend of bad geometries.. is something I saw on first tests, I remember (se my first post) it goes better when I goes back from magnetic joints to the original ball eye rod joints..

I will check the lubrification on my mag balls...

here we go....!

instead of what drawed before, I made (due to supplier wrong shipment) the Ø27 piezo support, probably more sensitive

here a short preview,
https://youtu.be/zSb38aC-XgE

looks good:

But unfortunatelly I don't understand this mesh... really don't...

I will check again geometry and road lenght with a caliber...

wait for your comments

Hi Everybody, thank you for the suggestions and sharing your experiences.

what I learned is to say bye bye to my BLtouch (i will recycle it on my ender 3 )

I designed new bed support to place piezo (Precision piezo kit Ø20mm):

...and problably i will move to a new print head solution to prevent tilt issues:

i will design a special cooler to proceed with my liquid cooling idea and create a compact effector...

hope you like it and i'm on the right way now.. thanks guys!

I forgot the other option, Piezo on bed. Here I think we have 2 roads:

Piezo under the bed (but i'm scared when i need to probe for ABS (bed @90/100°C, i think piezo suffer at that temperature.

Piezo under the bed support... but how many and where on ultrabase shape?

suggestions?

thanks again guys

@dc42
"I presume you have read https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer." Yes sorry I forgot... it was the first one when I start installing duet board on my predator

Honestly I thought the BL touch was not the best, also because as you can see, it has a great offset from the effector center axis (46mm), I thing by the geometry this can be one of the reasons it is not a good solution.

Nozzle contact probe (I think you're speaking about piezo probe) was one of the first solution i thought but i was scared about the mechanical application on my effector, especially looking forward for the double extruder mod...

Here the promised update i've done today:

As you can see here, the printing is quite well in the center of the bed, become far in negative Y cordinates and too closer on positive Y cordinate...

Here the actual effector configuration:

... Next step: design new effector for Piezo probe.

You think guys it'll need other mod, due to this new design?

Hi guys, I would like to show you what I'm working on.
I'm trying to collect here, in one place the troubles I have and what I've found on this forum.

some info first:

I start working on my Anycubic Predator in march, here what will be the final result:

The upgrade consist in:

-Duet3 Board + Panel I7* + Raspberry Pi4
-Double extruder
-Maxiwatt hotend heater *
-BLtouch V3 *
-Magnetic joint ¹
-linear bearings (rails)
-nema17 (0.9°)*
-Liquid cooling for extruders and (if possible) for motors
-... and other small things ...

*this is already done...
¹ I placed again the standard rods because as you will read, I've some troubles leveling the base

Now consider I'm working with the standard Anycubic extruder configuration: 1 extruder with flying motor (only maxiwatt heater and BL touch V3 upgrades are applied)

Major issues I've now is regarding the leveling, tomorrow I'll try to explain as well as possible what I do, trying to understand with you what is wrong. I've no doubt on rods lenght, but is not clear for me the endstop regulation

I anticipate you that I've read the following post found in this forum:

https://forum.duet3d.com/topic/13097/endstop-calibration-for-delta?_=1597433494622
https://forum.duet3d.com/topic/9741/wavy-ridges-in-mesh-bed-leveling-on-delta-kossel-xl/2

and this nice document:
http://boim.com/DeltaUtil/CalDoc/Calibration.html

but all my trials following the suggestions wrote, goes bad...

the best result I get with this config:
config.g
homedelta.g
bed.g

is this Heightmap:
heightmap.csv

and this is the beginning of print:

in the red area (positive Y) the extruder is very closer to the base, (on big Y values it touch the bed ).
green area is the reverse, little bit far from the bed (doesn't stich well to the surface) (I will take a better picture with white PLA, is more clear)

I don't understand yet where to work first... firmware or hardware...

Is the first time I made something at this level, probably i'm missing something stupid (I'm sure )

Any kind of suggestion are well accepted.

thank you guys,

Marco

I just understood what i've done, I opened the editor by the button on System folder:

i was thinking it was the actual configuration, but it's the first Json config i've made, probably the mistake come from there...

sorry if i gave you some wrong info

Hi again Phaedrux, that's it! thank you!

I put too much trust in my reprap firmware wizard

Thank you very much... now step by step I try solve other things on my config!

Hi Phaedrux, thank you for fast answer.

I've tried, unfortunately nothing change.

attached the last gcode i've made... I search for the M106, what i've not understood is how the board discriminate which fan start when it wrote M106 S255 when start the layer 2 on the example attached..

to complete the information (probably it helps understand where I get wrong):

(Ventola_Est = cooling for parts; Ventola_Dis= hotend dissipator cooling fan)

Hi guys, a little introduction: this is Marco from Italy, I started making some modification on my Anycubic predator, placing first a Duet 3 board... some issue solved but, i've some headhake with one thing:

When i turn on the printer the hotend fan is off, (I setup it to work in thermostatic mode at 50°C); when the hotend reach and pass that temperature, the fan start at 100%.... (good); issues come when I start printing (I use simplify 3D) because the fan slow down and I can't understand why. this (with wavy bed mesh) is making me Crazy.

Somebody can help me understand?

thank you all guys!

Marco

PS: this is my config File
config.g