This is an easy to print attractive cheek piece for the FX impact.  I have a MKII, but I think it fits the other versions as well.  

The steepest overhangs are 45deg the lack of top, bottom and side surfaces, when printed as shown, make the noticeable surfaces pretty uniform.  The exceptions being the top most edge and the surface on the plate, which is not easily seen.  I went through a few design variations before settling on this.  Some looked acceptable but this is the best I could find. 

The other advantage of this orientation is that the small contact area prevents warping and is easy to remove.  An added plus is that it is easy to remove.  You will need the single support for the suspended island.  I would draw the support on the edge shown and use the manual support settings.

It does give access to the barrel fixing set screw without removal.