I took a quick look, and in the models I have laying around here, a simple plain cube or rectangular bar shows ringing best (thus worst, with the most defects): 10mm x 10mm x 10mm, printed 100% filled. Or 15mm x 15mm. See the white dummy bar in the image below. This is where cooling is on the edge of being sufficient (and clearly insufficient in the cones).
Things that suffer from slowing down in corners are mainly tiny text: caps height 3.5mm, line-width 0.5mm, character-width ca. 2mm. Text raised 0.2 to 0.5mm above the surface. Here the ends and corners of the characters get visibly thicker. You can find test character sets on my page:
The zip-file includes the design files (RSDOC, DesignSpark Mechanical), and STL-files with raised, recessed, and hollowed-out test texts. The hollowed-out are for transparant materials only, of course.
All printed on an UM2 (non plus) in PLA, 0.1mm layers. So I don't know if this applies to an UM3 too,but you could try.
Did you already get some models to test your mod on? ?
Can you say a little bit more about what you're thinking off? I'm curious!
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