Do you have higher quality LM8UUs available than the C7s because I would not want us to be too noisy or delicate for Y axis of the Prusa I still would not go beyond 50mm/s at the limit what grease do you recommend the PTFE or molybdenum dioxide one.
We recommend using Igus bearings to minimize noise and lubrication, specifically item: 04140102
https://www.dhm-online.com/bushing-closed/2048-bearing-rj4jp-01-08-in-8mm-out-15mm-h-24mm.html