So now a note for those folks designing something in SketchUp to have printed at Shapeways. The final product is great but getting there can be totally frustrating.
I needed some truss plates (used instead of queenposts) for my Hopper car kits. I had some molded styrene ones on hand (this is 1:48 scale btw) and I measured these to get my dimensions for the SketchUp drawing.
Now Shapeways likes metric dimensions and the repair software (NetFabb) also uses millimeters so smart me did all my dimensions and drawing in SketchUp in metrics. I completed the grouping of (720) truss plates (I need 12 per car).
I then followed the standard procedure to export from SU as a .dae file and import to MeshLab to create and .stl file. Then open with NetFabb to repair any holes, edges, etc before shipping it off to be printed.
This is when I noticed that the overall size of the group was considerably smaller than the original drawing. And it wasn't in multiples of 10 as it should be if it was reading centimeters or millimeters.
After almost a day of fiddling I sent a copy of the files off to Ed Traxler (eTraxx) to see if he could figure out what I was doing wrong. At first he too was puzzled but soon discovered the problem. When you create a drawing in SU and then export it, SketchUp ALWAYS converts it to INCHES!
WTF! So what was happening, my drawing I made in millimeters was being converted when I created the .dae file.
So Ed went through the conversion steps in SketchUp to make my drawing in inches and then was able to export it and get it repaired in NetFabb at the correct size.
Why SketchUp even allows a drawing to be made in metrics is beyond me if it's going to convert it to inches anyways. The key here is to always check your overall size in NetFabb to make sure it is teh same as your original drawing. Otherwise you'll end up with a mis-scaled part from Shapeways.
Thanks to Ed for his help and tutorials.