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For the part cooling ducts, print whichever one you chose with the front face of the duct down flat on the build plate. This will give you the strength needed for the part. The Hero Me base should be printed with the back that faces the X gantry, place the back down flat to the build plate. Again for all the Hero Me parts, supports are needed (but not dense), and ONLY from the build plate. A good sharp Xacto knife is your friend when it comes to cleaning off the supports, careful they are sharp, I know this too well ;)