Really neat technique. I gotta try this.
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TLDW: When designing parts with modeled-in supports, split and export the model as separated pieces so slicer prints object and support separately. Also print at 45° angle.
I think in his particular case, this works, as he uses pla-gf or pla-cf, but in general, I doubt this technique works for any old filament, perhaps for Pla, and i doubt for petg.
I’ve tried printing without connecting pins and with them using petg, without connectors it didn’t work for me on bed slinger printer (expected), with pins it works fine (used this technique a few times before and it always worked). I think it’s not material problem per se more of movent problem, on corexy it printed both parts great.