I have tried to make the walls of my models thinner to cut down on printing costs and all it does is make it more expensive. Can you not make walls thinner?
Use the hollowing feature to make walls thinner. It will decrease the cost significantly if you are printing using SLA technology. If you are printing using SLS technology you have to add an escape hole manually then upload to Shapeways. There will be a price difference.
Let me know how it goes.
All the best,
Customer support service by UserEcho