Hello
What is this green-skyblue filler material that has the oil groovings and is glued on mill dovetail ways?
Mine mill has the same matterial and am looking to replace it
https://youtube.com/watch?v=Dt4f-FGwx_0

I have found c5 precision 3210 dfu(double) ballnut is this ok for Y axis
or to go with 5mm pitch which is better 5mm or 10mm ?
Standard servomotors are 3000rpm so with direct coupling 10mm will give rapids
30m/min and 5mm 15m/min which is too much in both cases.
So reduction will needed but is better to do reduction with precision reducers
that couple direct on servomotor or with timing belts-pulleys for example htd5m ?
Which of both options is more precise?