Terrific. I let the rail print go over night and the extruder got blocked again. I have a feel8by it's the last 10 meters of PLA that is the problem. I've read that the end of a roll is the worst for problems due to moisture, etc.

We're going to a craft store later and I'm getting a container and a bunch of silica gel. I think moisture might be an issue. Looks like unloading will have to be part of my routine...