Hello, 

I know you have been given disc brake spacers with your new bike and I also know that you have lost them.

So have I :)

But no worries. They are easy to print :) This simple spacer should work with both Shimano/SRAM (Avid in my case) brakes. It's dead simple - place between the brake pads, onto the brake pin and off you go!

Print with material of your preference. I personally used ABS with ironing.