Repeating with hair spray worked, but there was no noticable difference. I don't feel like throwing $150 at Simplify3D right yet.
Next attempt: Full height macro extension piece. First one clogged up quickly, but after a quick atomic, it went nicely. Suggests that my Z offset and/or initial layer height is too high.
The difference in magnification is noticable (note these are handheld shots, so not super sharp):
|Test piece at maximum magnification with EF-S 60mm f/2.8|
|Same test piece, same lens, with extension tube|
|Initial layer squeezed out so tight it turns white|
I printed a battery dispenser for tracked charged/discharged Eneloops. It came loose from the bed while printing, and when moving across a slightly lifted layer would make a chack-chack-chack sound. Now I know what that is, at least, but the lifting is problematic. In the end, it caused a jam, though the piece ended up OK:
As part of printing a dish rag holder, I experimented with making simple dowels. A good test, for it takes only 10 minutes to print a short pair, and it's obvious whether it works.
0.2mm layer height, outer walls first: 5.80-6.05 mm male/5.30-5.40 female
0.2mm layer height, not outer walls first: 5.85-60.5 mm male/5.05-5.20 female
0.15mm layer height, outer walls first: 5.60 - 5.80 mm male/5.25-5.35 female
0.1mm layer height, outer walls first: 5.65 - 5.90 mm male/5.25-5.45 female
Trying with perimeter adjustments of 80% exterior/90% interior. Also slowly moved the Z offset up to +0.1mm, since the first layer still got squeezed enough to be white, which I take as a bad sign.
0.1mm layer height, outer walls first, 80%/90% ext/int: 5.85 - 6.10 mm male/4.75-5.00 female
This also made the sides of both pieces look funny, with extra extrusion on the top part of the female piece, and some gappiness on the male piece. Probably not a good adjustment to make. Going back to default on those, and 0.15 mm layer height, but then (just on a lark) with 0.9 extrusion multiplier.
0.15mm layer height, outer walls first, .9 extr. mult.: 5.45 - 5.55 mm male/5.42-5.47 female