Like I said, it depends on the hot end you're using. J-head style hot ends do not get hot at the top where the extruder housing holds it.
Still, it's best to print that using ABS.
I gave up printing extruder housings for direct drive and went with this: http://z0qtmgiq6l41973z10dw0c5j3.wpengine.netdna-cdn.com/wp-content/uploads/2014/09/alum-extruder-close.png
Much more practical and allows easy access when (not if) you need to clear filament from the extruder
That said, the Prusia i3 guys have been getting along for ages with their geared drive/housing: