Shapeways: Bring your creativity to life in 3D
http://www.shapeways.com/forum/index.php
Shapeways: Bring your creativity to life in 3DFix Found for Export Bugs in XSI 7.0+
http://www.shapeways.com/forum/index.php?t=rview&goto=4184&th=892#msg_4184
1. Open the scene in the current version of XSI
2. Use crosswalk to export as collada 1.4.1
3. Open the exported file in a previous version of XSI.
4. Export as collada 1.4.0 from the previous version
This file should be accepted by shapeways. (If you still have a problem, it is most likely not related to the text.)
You will most likely get an error that the model is too large. Drastically scale it to a very small on screen size and re-export from soft image. Do this until you have the size you want.
As a final note, I am not sure whether the problem is with XSI 7.0 or Collada 1.4.1. It could be a combination of both.