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Thanks for your suggestions, Edward.? Any idea what the glass transition temperature might be?? From your comments, I suspect somewhere around the same as PETG, maybe 85c or so?? My google searches turn up results for regular PLA.

My initial fitment test prints were done with PLA at 10% infill, and while I did notice the 100% PETG resulted in the screws being slightly snug against the holes, it still appears to locate the worm shaft well.? There is a small amount of free space in the pocket (.5 mm) where the worm mounting plate sits, so that dimension is not critical.? We really only need to center the big pulley shaft (actually just off-center) between the two mounting holes.? So if the distance between holes shrinks ever so slightly, the shaft should still be more or less centered.? Please let me know if my thinking is flawed here.

If I find myself re-printing the brackets again, I'll give 50% infill a try.? If it doesn't seem sufficient, perhaps I'll simply beef up the bracket design.? At the very least, 50% infill would be a better use of material, gram for gram.? I really don't know how much rigidity is required here for tracking accuracy.? The actual delivered torque on a well balanced scope is probably quite low.

Thanks again for your comments,
-Tony