OK. X-blocks templates can be made on your own, if you want. It is easier to buy them however.
Andi R is correct there is more than just one size template ... I think the smallest is about 3 1/2".
Also. press the seams open and then the template won't wobble so much when it comes to trimming.
If you are in the Phoenix area, Zoe's Trunk [in Chandler?] has lots of resources for the different X-block quilts as they have done so many.
ali