what is this

Can someone tell me what this part is called? I’m trying to find the part file so I can print a new one.
Thanks

It’s called the extruder idler block

Here it is:
http://devel.lulzbot.com/TAZ/Olive/production_parts/printed_parts/extruder_idler_block/

Here is a modified version:
http://www.thingiverse.com/thing:1245849