Export 3d spline coordinates

[Jaynen]

I have multiple complex splines that I have joined together using a fit spline. The spline is 2000 meters long and I need the xyz coordinates of the spline exported to a text file in 0.5 meter increments. So it's alot of points. Ive tried reference points and then converting entities in a 3d sketch and exporting but I can only do 100 points at a time. This is really time consuming. Can anyone think of another way? Thanks.