Jump to content
UltiMaker Community of 3D Printing Experts

additional fan for Ultimaker Original+


Recommended Posts

Posted · additional fan for Ultimaker Original+

Hi people of the Ultimaker community,

I recently got my UMO+ to actually start printing. The prints look great and the printer is really fast. Although the overhang quality was kind of a disappointment.

 

I experimented with the temperature of the nozzle and the fan speed a bit but still no nice quality.

 

As I read online, adding a fan improves the quality of overhang printing. So I want to add a fan. I have two super silent 30mm 12v fans laying around which I want to use for this setup.

After taking the stock fan off I noticed it was a 24v one and not 12v as I read everywhere online.

 

Is it safe/useful to use these 12v fans?

I don’t really have much knowledge and experience with wiring and electronics, can anyone explain me if and how this works?

 

Happy to join the community,

Remy

 

  • Link to post
    Share on other sites

    Posted · additional fan for Ultimaker Original+

    Thanks, I wasn't sure if the difference in amps would be an issue.

    Won't the second fan have less power due to resistance of the first fan?

    Or is the difference not even noticeable?

     

  • Link to post
    Share on other sites

    Posted · additional fan for Ultimaker Original+

    Thanks, I wasn't sure if the difference in amps would be an issue.

    Won't the second fan have less power due to resistance of the first fan?

    Or is the difference not even noticeable?

    It's voltage what defines this. And that's why you need to hook them up like that. The board supplies 24V. And the fans are 12V. So putting them in series will give both 12V

     

  • Link to post
    Share on other sites

    Posted · additional fan for Ultimaker Original+

    What are the requirements for a fan? I think someone from Ultimaker once said you need good static pressure, but I am not all too sure about that. They definitely experimented with it, though.

    Is there anyone from Ultimaker that can fill us in?

     

  • Link to post
    Share on other sites

    Posted · additional fan for Ultimaker Original+

    You need good static pressure and airflow. You will also want a reliable bearing. I went with this one when placing my failed fan http://www.digikey.com/product-detail/en/ME40101V1-000U-A99/259-1566-ND/2757791%20.%20It%20has%20a%20

    It turned out to be smaller than the original fan (OD was 40 mm instead of 40 mm screw hole spacing), but it still provides plenty of airflow. I use one of them with the aforementioned Tapir Shroud ( just printed a small size adapter plate ). Would probably be perfect for a dual fan setup ( smaller and lighter than original fan.)

    The main caveat to this fan is that it doesn't like unfiltered PWM. This is easily solved with a RC low pass filter. I used a 40 ohm 1 Watt resistor and 10 uF ceramic capacitor. That also brought the max voltage closer to my fan's specs. For dual fan, you would want to use a smaller resistor and larger capacitor. My arrangement should have a cut off in the KHz range, which is probably way lower than needed (I would guess the PWM is at least in the 100's of KHz.) A 1 ohm resistor and 10 uF cap would would probably do the trick just fine.

    Edit: Just noticed that marlin's PWM frequency may be far lower than I would have assumed. Some people are posting that it is only 7 Hz in software mode. Not sure if UM is using hardware or software mode. I am sort of surprised that the RC filter I used would have much effect at that frequency.

    Ok, looks like the PWM frequency is about 30 KHz (Measured a period of 6.5 div* 5 uS/div = 32.5 uS), so 1/RC should be less than 10,000/s.

    BTW, I have seen some posts that say the UM is not grounded, but I can say with good confidence that it is at least ground relative to my oscilloscope BNC ground.

     

  • Link to post
    Share on other sites

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now
    • Our picks

      • UltiMaker Cura 5.3 stable released
        In this stable release, Cura 5.3 achieves yet another huge leap forward in 3D printing thanks to material interlocking! As well as introducing an expanded recommended print settings menu and lots of print quality improvements. Not to mention, a whole bunch of new printer profiles for non-UltiMaker printers!
          • Thanks
        • 21 replies
      • Here it is. The new UltiMaker S7
        The UltiMaker S7 is built on the success of the UltiMaker S5 and its design decisions were heavily based on feedback from customers.
         
         
        So what’s new?
        The obvious change is the S7’s height. It now includes an integrated Air Manager. This filters the exhaust air of every print and also improves build temperature stability. To further enclose the build chamber the S7 only has one magnetically latched door.
         
        The build stack has also been completely redesigned. A PEI-coated flexible steel build plate makes a big difference to productivity. Not only do you not need tools to pop a printed part off. But we also don’t recommend using or adhesion structures for UltiMaker materials (except PC, because...it’s PC). Along with that, 4 pins and 25 magnets make it easy to replace the flex plate perfectly – even with one hand.
         
        The re-engineered print head has an inductive sensor which reduces noise when probing the build plate. This effectively makes it much harder to not achieve a perfect first layer, improving overall print success. We also reversed the front fan direction (fewer plastic hairs, less maintenance), made the print core door magnets stronger, and add a sensor that helps avoid flooding.
         

         
        The UltiMaker S7 also includes quality of life improvements:
        Reliable bed tilt compensation (no more thumbscrews) 2.4 and 5 GHz Wi-Fi A 1080p camera (mounted higher for a better view) Compatibility with 280+ Marketplace materials Compatibility with S5 project files (no reslicing needed) And a whole lot more  
        Curious to see the S7 in action?
        We’re hosting a free tech demo on February 7.
        It will be live and you can ask any questions to our CTO, Miguel Calvo.
        Register here for the Webinar
          • Like
        • 18 replies
      • UltiMaker Cura Alpha 🎄 Tree Support Spotlight 🎄
        Are you a fan of tree support, but dislike the removal process and the amount of filament it uses? Then we would like to invite you to try this special release of UltiMaker Cura. Brought to you by our special community contributor @thomasrahm
         
        We generated a special version of Cura 5.2 called 5.3.0 Alpha + Xmas. The only changes we introduced compared to UltiMaker Cura 5.2.1 are those which are needed for the new supports. So keep in mind, this is not a sneak peek for Cura 5.3 (there are some really cool new features coming up) but a spotlight release highlighting this new version of tree supports.  
          • Like
        • 22 replies
    ×
    ×
    • Create New...