Decide size of block and then Calculate based on a regular nine patch then subtract 1/2"for finished size of the DP9 to know how many blocks you will need. The DP9 reduces the regular 9 patch by 1/2" This should give you instructions.
http://www.popularpatchwork.com/news/article.asp?a=5294
Last edited by Holice; 04-15-2012 at 12:52 PM.