I'm trying to print with my Makerbot Replicator 2. This issue has started happening just in the last 2/3 days. I have a problem where the filament isn't coming out of the extruder. It happens when the printer starts with the infill. The first 2 layers are usually fine.

I really started to notice the problem when I put a little mark on the filament to see if it was being pulled into the extruder. Here's what I saw

https://www.dropbox.com/s/no9jk61kqr...45823.mp4?dl=0

The filament isn't going in, but every now and then it's pulled back up into the extruder. I know this retraction is normal when the head moves when it doesn't need to print. But why isn't it pushing filament through?


Steps I've already tried:
1. I've checked to make sure the extruder isn't clogged
2. I slowed down the print speed by half
3. I've increased the extruder temp by 5 degrees

No changes.