Why does my model render backwards?

@waltp wrote:

09.png1050x1316 99.4 KB

TrackRoller09.skp (376.7 KB)

So how do I use the current SketchUp to create an item with concentric bands and have it printed properly? What I attempted was:

1. Create the 4 circles
2. Create the axes thru the center point
3. Erase the lines to make the basic shape and erase the faces for the holes
4. Pull the first level
5. Draw circle for the depressed area and pull
6. Draw the next outer circle and pull both to size
   … repeat for 5 & 6

Previous versions filled in the holes either partially or fully, and left out one of the indented stripes.

My technique obviously doesn’t work. What is the proper way to create this image?

Walt

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