This isn't good. Any pointers on how to remove it?

Yep. I was home at the time, just didn’t check it. I don’t print if nobody is home.

For a future print, a soldering iron work quite well. Heat up the extruder but use the iron to cut the parts that won’t go through your fan shroud. Also cut two planes at the back of the heater block through the part. Then you can deal with it separately.

A large soldering iron with a knife tip is the great. https://olimex.files.wordpress.com/2016/02/chn-t907-k.jpg