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Crossfire: It is what it is.

Only modifications I've made since first cut were smaller pulleys (faster acceleration cutting thin material) and solenoid/hose/nozzle to spray water while cutting.

 

The dual-row RM2's (at the other end of the imported/junk bearing spectrum vs. 608's) on the resin rails are quiet and silky smooth. The grooves immediately develop a slippery shiny/glazed appearance, don't seem to wear past that, and there is no rail residue accumulating on the wheels or bottom of grooves. First 3D printer constructed with same rails and bearings that I gave to friend's wife has been running day and night for many months (probably at least a year, I don't remember) and hasn't required a bearing replacement or any adjustments to compensate for wear (as opposed to her commercial printers - FFCP, etc. - that I see regularly for bearing, MOSFET, or pulley replacements.). I'm probably biased due to endless supply of phenolic resin drops but the resulting rails hold up very well, are strong, and result in fast and accurate linear motion for so very little money and effort.