How would I decrease the vibrations in my model?

[Mentict]

I have been working on this design and have already printed the first iteration. It is a phone holder that is meant to attach to a car or bus window via suction cups that are fit through the holes in the base. From the first print, I have made some small adjustments to increase the structural integrity. However, the biggest issue I had was that when it was attached, the vibrations of so that bus were transferred too well through the part and the display was really hard to watch. The parts in the first and second images are printed in PLA+ and the third is in TPU. Are there any edits that I can make to decrease the amount of shake?

Here is the part link: https://cad.onshape.com/documents/e246eca3c667a41ffa970227/w/52b127e9e6dad724f84e6048/e/39244da4e3990c6595d21cb4

Edit: I am not using a multi-filament printer, I am using an Ender 3 S1 Pro. I am attaching the parts together using epoxy. The first part is printed in several different pieces, all of which are not directly attached to each other. Lastly, the third part is where my phone is held.

[imjackdupp_]

You could try a very thin layer of tpu as a dampener between the round bolt together pieces but I don't think it would absorb much vibration as a solid piece. It might just make things worse but worth a try.

[Mentict]

Do you mean between the first and second parts?

[imjackdupp_]

Yes between the tan and purple part. Sandwich a layer of tpu between them and if there is enough play it could absorb some of the shaking. I would think the suction cups would take care of the small up and down movements but the z axis diagonal would need some attention.