Adapter from 3.5" to 5.25". Rough version made for further machining and painting.
I will also leave the original file so that You can adjust this model to your needs. I will be glad to remixes.
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Rough version made for further machining and painting. But You don't have to.
Fitting after printing - all came together
Result after treatment and painting
I attached the adapter to the PC body through M3 screws and nuts. Not the most convenient option, but I think it is-qualitatively.