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New fan duct for UM2

Improve original fans in directing wind on print.

-Printed in PLA at 205ºC/30mm/s.
first test i made a bridge without support and it works.
UPDATE:
 MARCH 10: - V01-04: improve left support that was shocking on wall during initializing.
      Left and right are now fitting with Olsson bloc. can move up and down 5mm. Not tested but may work.