Thick ink after printing-equation math type

Hello.I import  as always  equations  from mathtype to word  and  convert to pdf  with  word's ''save as''  option.I print it  via  acrobat reader  settings .with my canon pixma mp 640(i also  change  the canon settings).i  always  choose  to math  type the bold  but always in the printable file the ink was  ''normal''.The  last months i  notice that  is very thick.I do not now if  is  a  printer issue  or math type  issue or   acrobat  reader  issue  or all  of them.I attach   8  screenshots(and please tell me  if  you  have  access  to these).Are  screenshots  with  how  it lookes the  font  at pdf  and  ''after'' printing  with :1) original factory  settings(times new roman)  and 2) choosing   cambria  math Also  i  attach my acrobat read printer settings