I've experienced some success with making a sample of an anticlimber I hope to use on my 4000 model.
I just received the print out from Shapeways and am pleasantly happy with the results ...
This picture shows the printout next to an MTH 6000 series. I just did this as a test to see how it would turn out and experiment with rivet sizes. The rivets are 3/4" in circumference and 1/2" tall.
A closer view shows more detail:
I sprayed the part with grey automotive primer so the details would stand out. The surface appears rougher than it actually is. The dimples on the ends are guide holes I will use to drill for grab irons.
With this test successful, I'm continuing to model the rest of the car end and hope to have a completed, printed car end in about a month.