Prusa Core One - Resonance noise eliminated with slide bearings

Please read first

Important notice

Experimental mount for two slide bearings for a Prusa Core One! This article uses a bearing mount that differs from the original part with Prusa linear bearings! 

I accept no liability for any damage to persons or equipment that may occur during conversion. You act at your own risk!

UPDATE 17.02.2026:

I would like to point out once again that my primary concern was to reduce noise during printing. Existing problems with surface waviness at certain speeds have other causes.

______________________________________________________________________________________________________

Index of Changes

17.02.2026

• Images from the first VFA test uploaded

• Note added regarding the priority elimination of noise and not the waviness of the surface

______________________________________________________________________________________________________

15.02.2026

• Version 1.00 uploaded

• Project details uploaded

• STEP, STL, 3MF and GCODE Files uploaded

• Youtube Videos uploaded and linked

______________________________________________________________________________________________________

Project background

Loud rattling, ringing, or metallic booming and annoying resonance noises during printing for a good two months have now prompted me to take remedial action.

In the English-language Prusa forum and on Reddit, there have been numerous attempts to eliminate this metallic noise. Among other things, there was a suggestion to use plain bearings.

The original Prusa linear bearings are pressed into a metal housing. To avoid having to remove and adapt them, I simply designed two simple mounts.

______________________________________________________________________________________________________

Additional material

Sliding bearing

I used two slide bearings that I purchased here:

https://www.roboter-bausatz.de/p/gleitlager-igus-drylin-rjmp-01-10-lm10uu-alternative

Threaded inserts M3

I use four M3 threaded inserts from Ruthex per mount.

______________________________________________________________________________________________________

Tolerance notice

The print file has been designed with a dimension of 19.05 mm. The bearing may have different dimensions when delivered.

It is important to note that inserting the plain bearings into the holders with force will result in sluggishness of the entire Y-axis.

The plain bearings must fit into the holders without force—only then will the bearings run smoothly from left to right on the round bar.

______________________________________________________________________________________________________

Videos

I tried to record the noise behavior before and after on video.  On my printer, the resonance noise was loudest at print speeds between 70 and 80 mm/s. 

Before the conversion:

The before video shows the noise at 75 mm/s. Unfortunately, I had to provoke it, but that's exactly how it sounded when it reached this critical pressure speed.

For comparison purposes, I modified a print file to move only the Y and X axes at a critical speed: Noise_Testing_0.4n_0.2mm_PETG_COREONE_58m

After the conversion:

After printing and installing all four bearings for the slide bearings, the result was surprisingly good! No more annoying metallic noises during printing. 

The difference with this change is now very clear, and I am glad to have finally brought about a positive improvement.

For comparison purposes, I modified a print file to move only the Y and X axes at a critical speed: Noise_Testing_0.4n_0.2mm_PETG_COREONE_58m

______________________________________________________________________________________________________

VFA Test

Yesterday (17.02.2026) , I conducted another VFA test with the two slide bearings.

I used PETG Black from Bambu Lab. I will have a glossy PETG available for testing again tomorrow. I believe it is still evident that the waves have not improved significantly.

As has already been mentioned on the prusa forum several times, the wave spacing is exactly the same as the tooth spacing of the GT2 pulley. Nice to see at the 30-degree test week.

My VFA test ranged from 50 to 150 mm/s in 10 mm/s increments.

Front and back - 90 degrees

Front and back - 0 degrees

Front and back - 30 degrees

Front - 60 degrees