I have installed a Duet/Ethernet onto a Rostock Max V3 with an SE300 hotend and I'm trying to print a NASA Saturn V S-IC F-1 combustion chamber by faithfully printing the 356 lower tubes and 178 upper tubes using G2 circles over and over and over and over and over.

This part has 226,000 G2 commands in it.

I'm literally amazed that I can print a 1mm diameter circle using a 0.5mm diameter nozzle and it looks great.

I <almost> can't see the stepper motors turn as it's printing a circle.

And the extruder also seems to not be moving.

It's very impressive that the Duet can handle such teensy-tiny movements on a delta printer.

Thanks for all your work.

I've been using G2 for a while now, and have started using it to do X,Y,Z moves and it works perfectly.

Most of the online GCODE previewers don't render this correctly, neither does Simplify3D.
This previewer does render them correctly.
https://nraynaud.github.io/webgcode/

So, thank you for allowing my SeemeCNC Rostock Max V3.2/Duet to perform the proper motions to allow me to make things. (That seam has gone away since I started doing X,Y and Z moves for each semicircle.)

This object had a diameter of 2 inches and there are 178 G2 semicircles in each layer.

spiralG2.gcode

I don't know what version you are running, but this section will tell you how to disable a filament monitor for different versions.

https://duet3d.dozuki.com/Wiki/Gcode#Section_M591_Configure_filament_sensing

V1.21 to current: Sn 0 = disable filament monitoring
Earlier than V1.2: Pnn Type of sensor, where: 0=none,

@fotomas You can measure the voltage across the transmitters by connecting a voltmeter from RED to RED or BLUE to BLUE.

When you start printing, it will list each layer and a graph showing how long that layer took to print.

HERE'S a document that describes it.

Here's a more detailed one.

Here's a description about how to use the PS_ON signal to kill power to an SSR using a relay in case of a heater fault.

@konte1978 said in help me connect the Filamento laser monitor on conn_lcd pin 3:

C "conn_lcd.encb, connlcd.3"

THIS thread says to use C"connlcd.encb" for the M591

I think when THIS page says "connlcd.encb, connlcd.3" it means you can use either one of those names, but not both of them at the same time.

@arhi Are you sure you're calibrating the controller every time?

It looks like going forward, you get 0.5-degree of error, but going backwards, you get MUCH LESS error. Under 0.1 degree

Maybe try going three turns forward and then three turns backwards just in case it take one-turn to calibrate or something.

I bet you are hitting your bed radius limit in that corner causing the curve. I've done that on my SeeMeCNC Rostock Max V3.2

Can you post your config.g so we can see the delta parameters?
You would need a radius of minimum 113.2 to print that square.

Also, use the DWC to manually move the nozzle around and see what (x,y) coordinates you get for the three square corners and the round one.

I write little programs in C that generate GCODE.

Just one unrelated comment: I get worried when there's a metal bolt running through a PCB with a metal nut on the other side.

That is an invitation to short from the front layer to the back over time as they wear through the solder mask. Sometimes that's no big deal, and sometimes it's an invitation to cause real problems.

Nylon washers can help, but I personally prefer using full nylon bolts and nuts for mounting.

Just something to think about.

@arhi Are you sure you're calibrating the controller every time?

It looks like going forward, you get 0.5-degree of error, but going backwards, you get MUCH LESS error. Under 0.1 degree

Maybe try going three turns forward and then three turns backwards just in case it take one-turn to calibrate or something.

The closed-loop mode of the S42B is not intended to improve accuracy compared to open-loop mode when the motor load is well below the motor's load limit.

It's intended to improve accuracy when the load intermittently exceeds the maximum motor load.

Try your open-loop vs. closed-loop experiment and hold the rotor with something for 10 steps and see how the closed-loop corrects for that once you remove the load and the open loop mode does not correct the error.

THAT'S what the closed-loop mode is for. It might cost you some accuracy in the step-to-step positioning, but you gain the ability to (when the load is lessened) correct for overload conditions and missed-steps.

Open-loop cannot do that.

@arhi Do you mean that the values you are reading are changing by plus or minus one if you read the encoder a lot of times?

Because that's not unusual for such a high-resolution encoder where one count is 0.005-degrees of angle.

Also, it's possible to get a +/- 1 oscillation if you stop RIGHT ON the edge of a line and move an infinitesimally-small angle. But I wouldn't expect that on every step. You showed three steps where it was doing it, so I think it's the controller.

Hey, depending on how the s42b reads the TLE5012B angle sensor it can really only get either 15 bits or 16 bits of value from the angle of the magnet, so your encoder might have twice the resolution of the controller.

15 bit representation of absolute angle value on the output (resolution of 0.01°)

16 bit representation of sine / cosine values on the interface

So I think the controller is doing about as well as it can.

Jesus that's terrible.

I know I'm not helpful, but I can express my sympathy for the problems you are experiencing.

How about trying a calibration cube (without the X,Y and Z inserts) instead of this?

I'm afraid I'm out of my experience zone with ABS.

I have read not to use fans for the first 3 layers, but that's not your problem.

Do you see filament extruding on the back cornets?

Do you hear your extruder struggling/clicking when that happens?

Can you rotate the cube 180-degrees to see if it then happens on the front?

Can you rotate the entire printer 180-degrees to see if it changes due to airflow?

Do you have an enclosure?

My only ABS experience is using a Stratasys where everything is controlled for me and it works perfectly.

Someone with more ABS experience will probably jump in next and hopefully be able to help you more than I can.

I print PLA at 60C bed and 205C extruder, so you're significantly hotter than I am.

@dmbgo Try that upload again please.

Also, what filament are you using?

@dmbgo Can you File->Save Factory File as... and post it?
That way I can see your slicer settings and all that.

Wow, that really IS terrible.

Can you save your factory file and post it here so I can load it and take a look?

What filament are you using and what temperature are you setting the bed and extruder to?