We needed scratch disk space on our old and out-of-service Dell R930 cluster servers.
Origiinal replacement part 1 TB 2.5" SATA in nice labeled hotswap tray: 350 EUR.
Bulk 5 (!) TB SATA drive + 17g PLA 180 EUR. The printer is starting to pay off 8-)
I also tried to print the light guides with transparent CPE but it's almost impossible to make them work. To check drive status LEDs: peek through the holes.
I tried printing the light guides with CPE transparent, but oviously this didn't work. You can give it a try if you have dual extruder but I would recommend to leave it open.