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

UM2 Lights flickering

Recommended Posts

During printing the lights (led stripes) flicker slightly. They do not flicker when the UM2 is idle. I have the feeling that it is related to the stepper motors because the light seems to flicker when the head moves. It is not a big deal, just thought that it might be a sign for a bad board connection or electrical interference that can be fixed.

Thanks.

 

Share this post


Link to post
Share on other sites

i had this problem as well...

problem was... the LED strip was loose behind the front panel and was always pushed around and vibrated by the pullys moving and turning.. the lights at night looked like christmas tree flicker lights..

Ian :-)

 

Share this post


Link to post
Share on other sites

I had the same thing as Ian at one point - the jumper wires connecting the top and right LED strips were catching on one of the pulleys in the front right corner, and making the lights flicker. Bending the wires out of the way (a bit tricky to do in the tight space) fixed it for me.

Share this post


Link to post
Share on other sites

The flickering is subtle and I hate it. It happens when the bed is getting close to the correct temperature (from 4 degrees below goal temp to 1 degree above). When you first start heating it is fine. When you turn off the bed heater it is fine. It flickers at the PWM frequency when you get close to the correct temperature. If I look straight at the printer it bothers me. If I look away it bothers me.

But usually I can just ignore it. Or I can just crank up the temp 5C and then lower it 1C lower than current temp. lol. I have the power!

 

Share this post


Link to post
Share on other sites

I thought that "changing the PWM frequency of the heater" could be done in software.

 

Yes, can be done, but I'll have to double check that nothing else is attached to that timer.

 

Share this post


Link to post
Share on other sites

Humans can see up to 50Hz. In countries that use 50Hz electricity I notice lights flickering sometimes. 60 Hz I can't see. But the flicker is only slight so I don't think 50Hz would be visible but it would have to be roughly that kind of frequency for me not to be able to see it.

Wouldn't this decrease the lifetime of the FET that controls this circuit? Maybe not. But it might get hotter than at the slower frequency.

 

Share this post


Link to post
Share on other sites

Our two week old Ultimaker has flickering lights. Not due to PWM/heating but "lose-contact" flickering.

 

The lights flicker on and off while printing. Probably due to the belts hitting the LED wiring. I haven't been able to find the exact spot yet.

Any thoughts?

 

Share this post


Link to post
Share on other sites

As you look at the front of the printer look behind the front panel in the top left and top right corners, where the horizontal LED strip is connected to the two vertical ones. There's a short piece of wire that runs between the strips, and which can tend to stick out and catch on the pulleys.

The wires ends of the wires are wrapped in heat shrink tubing where they join the LED strips. Put a drop of superglue between the heat shrink tubing and the front wall of the printer and stick them flat on the wall. That should move the wire out of the way of the pulleys, and keep it there.

 

Share this post


Link to post
Share on other sites

The LED strips were loose from the ultimaker frame in the top left corner. I'm not sure if this caused the flickering. I cannot reproduce the flickering when touching the LED strips.

Hope it does not turn out to be a PSU problem.

 

Share this post


Link to post
Share on other sites

Hope it does not turn out to be a PSU problem.

 

I don't think so. You would hear it in the steppers as well. Did you glue the lights away from the belts yet?

 

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  

×

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!