We have recently gotten into making homemade bread, and sometimes you want to make toast of it which requires an evenly sliced piece of bread.  Or a sandwich of it.  This easy jig makes an evenly cut slice of bread.  It is fully adjustable to your preferred thickness.  Just place the loaf of bread in the jig up against the vertical wall, slide the blade guide to as thin or thick as you like, insert your bread knife blade within the slots and slice.  

 The blade guide slides in from the front.  Depending on how clean your print is, you may need to do some post-processing clean up of the two parts, within the track, to have it slide through it smoothly.  I had to do a bit of trim and sanding.  You could also use a drop or two of food-grade oil within the track.