I just got a Flashforge Dreamer. I have tried it out with mostly success. I tried printing a geodesic dome in ABS with PLA support and the first attempt did not work. The dome had a radius of 20mm and each element was 2 mm thick. The default slicer generated support for the center, but not for the edges that are mostly vertical. I increased the element thickness to 3.33mm and tried again. By default, support material is not enabled. I forgot to enable it, but it worked anyway.

I have been thinking of designs that would make removing non-disovable supports difficult. What criteria can we use to determine if a part needs support?