The Afinia is basically extruding a .15mm diameter bead of ABS plastic heated to 250 degree Celsius. So, first off, you can't get better detail than .15mm. Second, at 250 degrees, it will melt together any details or surfaces that are close together. Part of the learning curve was finding out how close together different parts of an item could be without melting everything in to a blob. Also, what was the smallest cross section that could be printed. Because there are a lot of variables, this can be a moving point based on the size of the items, how much time the heated head spends in a small area, etc.
Here is a time lapse done by Christina Chun of an Afinia printer printing a gear key chain. Although it looks like it prints fast, I would guess this is a couple hours of print time.
One of the first of the larger items I printed was an HO scale elevator tower to sit on the roof of a building. To print in on the Afina, I broke it up in to several pieces. Here is an early drawing. It has a vent on three sides, and they are see through vents, so if you wanted to put a light in the tower, the light would show through the vents.
I broke it up in to four major parts, the walls, the roof, the vents and the door. Here is a picture of the walls and the roof as they were removed from the printer. Notice not only the raft that must be removed from under the
print job, but notice all the support material to hold up the walls above the door and windows.