VCore 3.1 300mm - reason for second peak on Y-Axis???

Dear all,

just set up my printer from scratch and now I'm doing the belt tension and resonance tests. Resonance shows a second peak, which I can't explain 😦

Belt tension - used the Macro Position which sets the Printhead to X150 & Y150mm - which means a free belt length of about 175mm - its hard to tell where its getting contact to the idlers.
Used Spectroid to set both belts to around 94,5Hz - 95,0Hz

Belt tension Diagram shows equal Resonance peaks ...

Resonance of X-axis looks quite good to me, but Y-axis shows a second peak and I have no idea where it comes from 😦

Any Idea whats going wrong with my printer?

BR, Volker
belt-tension-resonances-2023-01-13-091442.png
resonances_y_2023-01-13-092256.png
resonances_x_2023-01-13-092245.png
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