Small clip on diffuser/bounce for the on camera flash of the Canon SL1/100D, Its not going to work as as well as a bigger one but it keeps in line with the compact nature of the camera and still makes a big difference.

With the flash popped up slide the hook part under the flash from the front and pull up to hook it around the flash, it should snap into position.

I printed with natural ABS with a .4 mm nozzle and .3 mm layer height.
You can try different things and please let me know what you find, I think white would bounce more and not let as much through but I don't have any to try with.