Got a shroud modeled for radial fan. Positioned it below the X-beam, seems I can get away with it without reducing Y-movement much. Printed in ABS, with a load of supports. PrusaSlicers supports are quite good, but with ABS I had to design in some custom supports without gaps, because some parts of the prints weren't bonding enough to the supports and were lifted off due to curling. OTOH, the supports were quite easy to remove. Win some, lose some.
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It does seem to help, the radial fan I have are quite powerfull. Currently running one @ max 45%, could maybe go bit more higher. Defining max speed for fan in RRF happens with M106 X122 (122 being the speed 0-255). The prow on the benchy is now definitely better. Other parts, the same. Is suspect that the layer issues are due to the Dollo itself, there might be some backlash or some other mechanical inconsistency going on. Also some small zits, can't seem to get rid of them with Volcano. Maybe a really long wipe would do it. Well, not going to pursue better quality, the machine works well on more coarse prints and that's enough for me (for now).