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I liked the bladed scraper best and first used it to stop buildup of aluminium on the blade when I ran ~7thou guide roller clearance, since buildup on the blade affects the slant of the blade between the side guide rollers and thus squareness.

Then I realised with any sort of blade scraper you can run zero clearance on the side guide rollers, since the swarf running between the blade and rollers was what was destroying them and made us go to 7thou clearance in the first place and so I made the UHMWPE version.

Now I've made side guide rollers that sit with one ~1/4" higher or lower than the other and can run 'negative' clearance (less than 0.025") and the blade 'snakes' between the rollers and swarf has no effect on longevity of the guide bearings. .

However you have to completely remake the whole guide assembly to do that.

So now I don't need a scraper.?

My advice would be to make a UHMWPE or Acetal (Delrin) scraper and see if it does what you want. If the buildup on the blade is still unacceptable then make the HSS scraper version as its a lot more work. Run zero blade to guide roller clearance i. e. 0.025" between the rollers. Another advantage of the plastic scraper is that you can leave it in place when the vertical table is on, where you have to remove the bladed one.?

The correct cutting fluid for aluminium is kerosene (use deodorised stuff), just enough to wet the teeth not flood, then it evaporates off between uses minimising the mess. Kero will do for copper too. Don't use any cutting fluid for brass (it breaks up like cast iron, doesn't stick in the gullets & conducts heat really well so no need for lube or coolant) - jv