Jump to content
Ultimaker Community of 3D Printing Experts
Sign in to follow this  
thefordprefect

Resonance in Print Bed UM2

Recommended Posts

When printing at 100mm/s long items oriented front to back the print head touches a small printed lump above normal height the plate resonates.

This can be fixed by slow printing but 100mm/s usually prints ok

The initial oscillation obviosly causes further z axis height differences which the head then touches and this prolongs the oscillation. Eventually long sections of print get wavy.

this is a video at 240 frames/sec of the problem (printing at about 100mm/s)

www.youtube.com/embed/1GqTaTMnr6Y

the finished print looks like this:

gallery_34795_1054_80380.jpg

Is there any simple cure for this other than printing below 70mm/s? some damping mechanism - perhaps a plate of gel under the bed heater!?

 

Share this post


Link to post
Share on other sites
this is a video at 240 frames/sec of the problem

 

So... 8X?

Well if the downard acceleartion gets above 1G (and I suspect it does) then you should be able to put a small box or bag of sand on the bed and that should dampen it quite a bit. If you use a box, you need to only fill it half way - it's important to have an air gap so the sand can fly up inside the box. The vibration energy should turn into extremely mild heating of the sand and dampen the movement drastically. If it doesn't dampen it fast enough then probably you need a bigger box of sand. It probably won't help at all once acceleration is damped to less than 1G.

 

Share this post


Link to post
Share on other sites

You could use a liquid filled shock absorber. Or pneumatic shock absorber like those on screen doors. Connect it to the leading edge of the bed and to the floor of the bed. Seems drastic.

 

Share this post


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
Sign in to follow this  

Announcements

  • Our picks

    • Architect Design Contest | Vehicles.
      We're open for entries! - Design and submit your 3D designs of architectural entourage - vehicles - for a chance to win a large filament pack. Presenting an idea, an architectural design or something as big as an urban project isn't easy. A scaled model can really help to get your idea across.
        • Like
      • 27 replies
    • What The DfAM?
      I'm Steve Cox, an experienced engineer familiar with 3D printing. I wanted to share some DfAM guidelines with this community to help and make stronger parts.
      I'm also an Autodesk Certified Instructor for Fusion 360, so many of the images in ...
        • Thanks
        • Like
      • 23 replies
×

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!