RCA RP-190 Record Player Cam Rubber

This is a replacement cam "rubber" for the vintage RCA 45 record player (RP-190). If you have one that has hardened or broke in which it cannot be restored, it is possible to break the old rubber off and install this one made from TPU Air.

I tried 95A and 85A TPU but found it to be too slippery. I even tried to add fuzzy skin, but that did not work. The Siraya Tech TPU Air worked really well as it gives a non-slip surface. The TPU Air is a foaming TPU that can be adjusted based on the extruder temperature. 

After many experiments, I found I could generate what I think is a very nice rubbery part that works well for idler wheels and other rubber components that require friction to the mating part. The consistency feel like a cars fan belt.

I used the Siraya Tech profile that can be found on their web site. I used the 250C profile by loading their 250C project into Bambu Studio and replacing their model with mine. Here are the changes that I made to their model:

• Change print sequence from Object to Layer in the "Other" menu.

• Changed the infill to be 50%

• Set the infill pattern to Gyroid

I used the High temp engineering plate on the Bambu X1C and added glue stick. This stuff really adheres to the build plate!

I included a 3mf file for the Bambu X1C that contains the Siraya Tech profile.

The little circle in the inner portion of the cam print is to help align it to the cam during installation. Just align the circle with the corresponding hole in the cam. Once installed, the circle can be removed.

I am very interested to see how well the TPU holds up over time, The design of this was very challenging as I do not have a new cam to compare it to. Since this is a work in progress, I would like to get your feedback and suggestions if you try it.

Thanks!