MK3S+ X Axis Resonance
My MK3S+ has developed a loud resonance when the x axis travels between 60 and 80 mm/s. Faster or slower and it is very quiet.
I tried stealth mode and it helped somewhat but it was still audible.
I checked the belt tension with the Prusa app that listens to the frequency as well as the built in tension tool and both read just barely too tight with the tension set as loose as possible without moving the belt over 1 tooth. This was a pre-built kit I bought new and have never checked the tension until now.
I've got 34 days of runtime and several kilometers run through it.
RE: MK3S+ X Axis Resonance
Looks like the add media option didn't work, here's a link to a YouTube upload instead. ://youtu.be/8uAgSdgwstM?si=CXPVcnWjiZH0Z8Tn
What lubricant are you using?
Cheerio,
RE: MK3S+ X Axis Resonance
Whatever was in it when they built it. I have a tube of Prusa grease but have never taken it apart for a rebuild.
RE: MK3S+ X Axis Resonance
I took apart the back of the x-carriage and loosened the belt 1 tooth and readjusted the belt tension to be in spec with the tuner app and the on board self check. That lowered the volume some but the buzz/resonance is still there at those particular speeds. I think it's probably time to pull the bearings out and service them or replace them.
RE: MK3S+ X Axis Resonance
before you rip the printer apart, consider topical grease application, as directed at this link
regards Joan
https://help.prusa3d.com/guide/maintenance-tips_23200
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: MK3S+ X Axis Resonance
I tried that as well with no change.
On a correctly set up machine the built in tension metric does equate, roughly, to belt tension, but other things can affect mechanical resistance.
If there is enough resistance to movement to fool the belt tension measurement with the belts loose - then we must look for the resistance elsewhere. The linear bearings are a long way down the list of possible candidates. On a low useage machine dirt on the smooth rods or use of the wong lubricant are the first suspects.
Clean and lubricate the smooth rods, check they are not damaged/scratched: yes, do it again; your first application may have loosened stubborn grime that will now come free.
With the power off, move the axis by hand; is it smooth? Does the resistance stay the same over the whole range?
Check the idler pulley is not clogged, out of line, or damaged (loosen the belt and try turning it with your fingertip, is it smooth?)
With the belt loose try turning the stepper motor by hand; is it smooth?
Retighten the belt until it just begins to make a low musical note when plucked...
If the printer works, make your next print this:
https://www.prusaprinters.org/prints/46639-tension-meter-for-the-gt2-belts-of-i3-mk3s-or-prus
It MUST be printed in Prusament PETG or the spring tension will be wrong.
Let us know how you get on.
Cheerio,