Posts made by SM3D

Hi @CaLviNx,
Thanks again for your feedback! Approaching the slic3r developers is a good idea and I will pursue it ASAP.

Regards,
SM3D

Hi @CaLviNx,
Thanks for your feedback. It is more of our team's knowledge limitation (mechanical engineers but not developers/programmers) rather than the approach. I will soon ask my student to release the code and knowledgeable persons can integrate it with slicer. It doesn't have to be a single approach.

Regards,
Vasan

Hi Tony,
Thanks for your kind words. The next step for him is to improve the thermal simulations to predict the interlayer adhesion strength. We are planning to develop it as a web app (the FE analysis will be done in the cloud using Amazon Web Services) where you upload the geometric model and get the approximate settings for your requirement. You can then use the settings in your respective slicer (KISSlicer/Slic3r/Cura).

Thanks and Regards,
SM3D

Here is the link to the thesis by my student Vishal. It is about the effect of various FDM parameters on the strength of a part. In the end he developed an optimization routine which gives the infill type, infill density and perimeters for a 3D model given displacement/stiffness criteria. It will give a good starting point while designing parts by FDM rather than the trial and error approach.

Additive Manufacturing Thesis

Everyone in the forum, I appreciate your valuable feedback in this regard. I will soon send a video recording of his presentation and slides. Please feel free to share it. It will help us shape the future work in this area.

Let me know if you have difficulty in accessing the thesis.

Thanks and Regards,
SM3D

@otaku521 I too face the same problem - web interface shows a different value and I have to refresh the tab to see the current value.

In previous versions, it is either connected or disconnected. When it is connected, it is in sync with the actual print progress.

Cheers,
Vasan

@dc42 @Hergonoway The problem is solved. I reduced the frequency F parameter to 10 to see what happens and voila, PWM worked. Then I raised it to 100, still worked. I am yet to check higher frequencies (will do in the evening).

Previously, I used F25000, F500 and F100 but it did not work. Now out of the blue it works. I haven't changed anything in my setup.

Cheers,
Vasan

@dc42 I noticed one more issue. It happened twice after 2.0RC6 upgrade (past 2 days) - whenever I update the config.g file, DWC says it cannot be updated and loses connection. It shows under system editor only config.g.bak but no config.g files.

When I shut down the printer and restart again, it cannot connect or show my tools because config.g is not present. I have to take the SD card out and rename config.g.bak to config.g to make things work again. This never happened to me in previous upgrades.

Cheers,
Vasan

@Hergonoway I have trouble running the pump with thermistor from PWM controlled fan ports but I could run them with always on fan ports. Here is my post about it:

https://forum.duet3d.com/topic/5449/not-able-to-pwm-for-berd-air-pump/10

I even shorted the legs of thermistor and tried from PWM fan ports but no luck. If you have any ideas please post it.

Cheers,
Vasan

Hi David @dc42 ,
Thanks for your help and suggestions! My knowledge in electrical engineering is very limited so pardon my silly questions. I use duet v1.01, may I know where is the MOSFET source pin? I am trying to write the procedure in steps based on my understanding.

Step 1:

Check the resistance between V_FAN pin of FAN_0 and V_FAN pin of Always on Fan

Step 2:

Check the resistance between MOSFET source pin and ground pin of Always on Fan - Where is the MOSFET source pin in Duet wiring diagram

For Step 1 and 2 what are the typical resistance values?

Step3:

Connect the pump with thermistor to one of the PWM control fan pins then measure the voltage between:

(i) Negative pin of the PWM fan connector and VIN Ground terminal (-ve pin of the power input)

(ii) Positive pin of the PWM fan connector and VIN Ground terminal (-ve pin of the power input)

(iii) Mosfet source pin and VIN Ground terminal (-ve pin of the power input)

In the duet wiring diagram, if you can indicate where is the MOSFET source pin, it will be helpful.

If it involves a high probability of blowing up a MOSFET, I rather prefer not to do it because I do not have the skills to solder them back.

Thanks again for your help!

Cheers,
Vasan

@dc42 you are right. I took the SD card and made subfolders to make sure there are less than 25 files in each folder. Now I see all the files in DWC.

I did a small 1 hour print and no issues so far.

Cheers,
Vasan

@dc42 - As I mentioned yesterday, I could not find my old files in DWC but all the files are present when I access the card via panel due. I am at work so I will clear the cache and reinstall the duet web control when I get back home today.

I think somebody mentioned in other thread about fan sliders. I also have the same problem - I am able to slide the fan control by holding the left mouse button but when I leave the button the slider bounces back to previous value. If I start clicking step by step in small increments 5% each time, it works.

Cheers,
Vasan

Yes I agree with you that its odd. I don't know what to do. Thanks @dc42 for your suggestions so far.

Cheers,
Vasan

@dc42 I connected the positive from the pump directly without the resistor. I also tried by touching both the legs of transistor together effectively shorting them(hope I am correct) still no luck.

@dc42, I was running 1.21 firmware, 1.21 DWC and 1.21 wifiserver before.

I upgraded to 2.0RC6 firmware and 1.21.1 DWC and 1.21 wifiserver.

@dc42 I updated my firmware just now to 2.0RC6 and it wiped many of my .gcode files. Moreover, I could upload .gcode files without any error but I could not find them in the interface. I also cannot create a folder. Any suggestions?

Cheers,
Vasan

Took the SD card out, renamed the config.g.bak to config.g, the duet is back online but still I have this problem with the pump

Cheers,
Vasan

@dc42 I was travelling and could not reply you faster. Here is the configuration for fan

M106 P0 S255 I0 F25000 H-1

I tried both S1.0 and S255 but nothing happened with PWM fans. As I mentioned, the pump works fine with always on fan ports.

What is the difference between S factor mentioned in M106 and slider used in Duet web control? Do they perform the same function.

While I am typing this my config.g got deleted automatically and I see config.g.bak. Any idea how to recover my config.g file

@dc42 I had fly back diode and thermistor connected all the time. The pump does not run at all when I connect to Pwm fan ports but ran fine with always on fan port. I am not sure what is the problem with Pwm control of this pump. Any suggestions would be helpful.

Cheers,
Vasan

Hi all,
I recently got curious about berd air cooling, I got a 24V pump and followed the instructions regarding flyback diode and current limiting thermistor. My other post in the thread shows the setup pictures:

https://forum.duet3d.com/topic/4477/24v-pump-can-i-connect-direct/8

When I connected the pump to FAN0 or FAN2 (my original dual fan set up), the pump motor did not run. I connected directly to 24V power supply and it works. I connected my fans back to check whether I blew the MOSFET or not, but thankfully I was able to run the fans with no problem, so I did not blow the MOSFET.

I connected the pump to always on Fan port in duet and the pump works fine. I suspect that I might have the wrong PWM frequency, so looking at berd air configuration post, I set the F parameter in M106 to 25kHz and it did not work. I tried 500, 100 and the original 250 still no luck.

I am not an electrical engineer but I think it has something to do with PWM frequency. I might be wrong. Can someone please help me to sort this issue. My duet version is 1.01 and I am running firmware 1.21

Cheers,
Vasan

Thanks @Hergonoway will update whether berd air is effective or not

Cheers,
Vasan