Lego Wreath Branch with wiring channel

Load the original branch part into Prusa Slicer, select the part and then use the "Add negative volume" command and the "Channel.stl" to merge in the channel part. You'll need to rotate the channel part by 135 degrees to align it with the original branch and then move the channel around until it's positioned correctly under the branch. Or you can simply use the "Branch with Channel" model included :)