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Wow! That is a lot of work to recreate the ducts from scratch in code! But now cool stuff can be done. Yes, I have also more than maxed out TinkerCADs ability to handle these parts, and they take forever to load to edit. TinkerCAD STLs as you have pointed out do not clean up well. I can make a version of the Hero Me Base that has mounting holes for the front pegs. I believe that it will need it based upon my experience with my original dual 5015 duct mounted with fans, it is heavy in the front and if the screws in the back are not really tight, it can vibrate out of position.