I would like to say thank you to this forum and in particualr to @deckingman @mrehorstdmd @Phaedrux for the help in rebuilding my d-bot.
I switched to 3 lead screw using deckingam setup. The bed is guided by only two carts on opposite angles of the printer each cart is made of 3 wheels.
I choose to use a bed with 3 levelling screws ( in the future I would switch to levelling the bed by the lead screws) the levelling screws is mounted using mrehorstdmd setup .
The bed is a 330x340 die cast pei covered 8mm thick. I switched to a 220 volts heating element from Kenovo
Now I cna print on 100% of the bed surface and I swithced off the
This is my first real print and I ma very happy with it I also disabled mesh grid compensation that for now seems useless

I still have to tweak a lot of stuff but the start seems promising!!

I am still trying to understand the bed leveling procedure.

Now what are the differences between G29 and G32 ?
Which part of the configuration this 2 commands read?
If I understand correctly the button in the web interface on "Machine Control " tab called "Auto bed compensation " run a G32 command .
In my case this run a procedure of probing and at the end I can see the mesh grid map, so it seems to me that the G32 command run the bed.g commands, right?

Now , with G29 command all seems to work the same except that the probel ( bltouc) doesn't deploy , so where I can add the deploy routine?

In my other printer ,Marlin based ,I have a script that run G28 and G29 before all the printing , what script should I use for compensate bed in this case?

Thank you for your patience

My config.g part of bltouch
[c];*** BLTouch
M307 H3 A-1 C-1 D-1
M558 P5 X0 Y0 Z1 H5 F200 T5000
M574 E0 S0
G31 P100 X0 Y-20 Z0.91 P1[/c]

And my bed.g
[c]G91
G1 Z6 F200
G90
M98 Pdeployprobe.g
G29 S2
M557 X30:270 Y30:270 S60
G29
M98 Pretractprobe.g[/c]

Thank you all for helping me.
I solved opening the case of the magnetic sensor and cleaning it. A lot of debris of plastic was around the ball bearings.
I made 2 hours of printing without issue.
Thank you

While I am trying to fix the squareness of the frame I finalized!the Z axis belt system
This is what it came out.
I tried to make the belt running as much as possible around the pulley with this setup all the pulley has 180 degree belt contact.
The 2 tensioners are temporary , I am going to print a support for it
Any suggestion will be appreciated.
Thank you
Andrea

Hi all.
I am not a very old and experienced 3d printer user,but during this 4 years , from the time I bought my first 3d printer, many things are changed.
When I started ,calibrating the step per unit and feed rate was te only and more "complicated "things to tweak for improve 3d printing quality and precision.
Now , we have a lot of stuff to play with ( pressure advance , jerk, ecc..). and I am quite overwhelmed form all this options.
Would be great to build a "complete guide to 3d printer calibration" collecting in a single place all suggestions and procedures spreaded in this forum and all over the internet.
Is there someone with time and knowledge able to start something like this ?
What do you think?

Thank you for your answer ; i read the wiki many times but many basic concept is supposed as "already know " and not explained from the basics. I am reading the reprap site also and I am starting to understand.
Please can you answer to the last question regarding this subject,
If I want to use a fresh bed level for every print it is sufficient put G32 in the slicing software start script

Thank you all for such great suggestions.
I am still not sure which way to go.

I have a no cantilever 2 lead screw single motors setup , changing to 3?
3 lead screws with one motor: pro lead screw always in sync con need manual adjustment
3 lead screws with independent motor pro automatic leveling of the plane cons a little bit more expensive , need software setup , risk of out of sync motors?
with this setup is bed leveling system still needed or the bed plate can be mounted fixed on the frame? Is it possible , and make it sense, combine mrehorstdmd bed leveling system with 3 motors lead screws setup?
I already own the extra Z motors so costs isn't a variable in this decision.

These are some photos of my printer take a look , any suggestion is appreciated!
https://www.dropbox.com/sh/7bvnlctmiqushv1/AAB_oR3lea8S2ZBIfeM5EsyUa?dl=0

Other question for D-bot owners.
I have 3 wheels Z guide, is it worth converting y axis also to 3 wheels, I read mixed experience about it.

@minim can you tell some more of your setup do you have some photos for taking inspiration:-).

Thank you all
A.

@engikeneer thank you very much for your input . I think I discovered the problem in a far from perfect printed angle.
I gonna try to check every angle I let you know

Thank you for sharing with us.
I have a magnetic sensor from about 1 year and it works flawlessly.
I don't know if laser costs less of magnetic, but the need of a bearing system in the laser sensor affect the simplicity of this device reducing or annulling the advantages over the magnetic one.
IMHO
.
good idea anyway

Hi guys , I am planning to change my D-Bot Corexy Z axis setup. My bed is quite heavy ( 330x330x8 aluminum ) and I would like to manage better the vertical forces applied on the lower ball bearing adding a thrust bearing.
This is what I am thinking about.

I have another question .
I saw people fixing the lead screw both on lower and higher part of the frame with 2 KP08, and in the middle a T8 screw attached to the bed structure. It seems to me an overconstrained structure and I am thinking about using only 2 fixture point bed and lower frame.

Thank you for your time.
Andrea

@jay_s_uk
thank you all ,
Can I use a DRV8825? I have several available. Am I correct in thinking that using the expansion board for the extruder won't affect performance, even if a less capable driver is used

@droftarts thank you very much for your comprehensive answer.
I didn't know about the BTT-EXP-MOT option, it seems a very cheap option. Does it have some problem I can incur using it?
I could use it to drive my single extruder letting the duet drive the 3 lead screws. Will still be possible to use a panel due connected with a 4-wire connection?

Andrea

I have a CoreXY printer evolved from a D-Bot, equipped with three lead screws for the Z-axis.
I'm considering converting it to use three independent lead screw motors. I already have the motors, but since I’m using a Duet 2 WiFi, I’m looking for the most cost-effective option to add an extra stepper driver.

Recently, I bought a Bambulab P1S, and I’ve come to appreciate the convenience of greater automation in the calibration process

Thank you all

Hi guys , I asked yesterday a question about changing extruder on a corexy with revo six hotend. Actually I have a titan extruder .
I was thinking about mounting a Galileo 2 or trying a belt drive Papilio .
I am stuck on how to mount the hot end and the E3D extruder. Can someone direct me on the right path?

this is my actual setup ( i have a filament sensor non pictured in this cad)

https://cad.onshape.com/documents/73137e421406cc09572cf4f4/w/fae666261e3e98f263a87ef7/e/6343374f983c257c2c313ee7?renderMode=0&uiState=67486c4b2d061c03821d5279

Hy guys,
I am running a 300x300x300 3 leadscrew corexy with a Titan extruder that is nearing its end of life and needs to be replaced.
Can someone suggest whether I should stick with Titan or switch to something " better / newer"?

Thank you

@oliof
Thank you sent an email to the seller.

Hi guys,

My printer has a scratched bed (PEI aluminum).

I would like to switch to a magnetic bed, but I need some magnetic adhesive as an interface. Is this a viable option, and where can I find a good heat-resistant magnetic interface?
Thank you

[link text](link url)

Hi all ,
I am experimenting on probing point and G32 .
If I use 3 probing points I receive :

G30 P0 X9 Y284 H0 Z-99999
G30 P1 X301 Y269 H0 Z-99999
G30 P2 X162.5 Y19 H0 Z-99999 S3

Manual corrections required: 0.00 turn up (0.00mm) 0.02 turn up (-0.01mm) 0.03 turn up (-0.01mm)

If I use 4 probing point the result is

G30 P0 X9 Y284 H0 Z-99999
G30 P1 X301 Y284 H0 Z-99999
G30 P2 X301 Y19 H0 Z-99999
G30 P3 X9 Y19 H0 Z-99999 S3

Manual corrections required: 0.00 turn up (0.00mm) 0.73 turn up (-0.37mm) 0.49 turn up (-0.24mm)

If I do a height map using 3 or 4 probing points the result are as follows.

3 points

4 points

What should I use?
are these results coherent?

Thank you
Andrea

@mrehorstdmd Thank you for your answer.

I made another test at the same speed with a triple-layer perimeter circular pattern.
My setup is a Revo Six hot end with a Titan extruder driven by a slightly underpowered Nema motor than the one suggested by E3D for Titan.

The pulleys and belts are okay, and the hot end attachment seems rock solid. My concern lies with the mini V wheels or the wheel bearings, which could deteriorate over time. I am searching for a reliable European seller to buy good-quality V wheels.

This is the result of the print at 130 mm/s. During the print, I could hear a rhythmic noise pattern coming from the Y-axis. This is the reason I am considering a wheel problem.

@mrehorstdmd Thank you very much for your suggestions.
Can you give me some hints on were to start to backtrace where the problem with under extrusion could be?
The extruder is a Titan extruder with a lot of print on the shoulder, maybe I could try to replace it but I don't know if replace it with another Titan or something else, I am tempted by BMG even If I have to design a new hot end carriage)

Thank you
Andrea