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I've seen the Dollo on the reprap website but did not look at it in to much detail. That is a good idea to alternate materials. Does the slide on the Dollo utilize a adjustable gib? My concern with a slide would be that the required clearance could result in some slop I think the major advantage with these bearing is that the balls allow you to create some preload which reduces the amount of slop. Although I've made a slide with a adjustable gib and there is not much play in the bearing.

https://www.thingiverse.com/thing:2809285

High Accuracy Dovetail Stepper Slide