I must remember not to tear the backing paper prior fully finishing (I did...), use 2 stitch length instead the general 2.5 (changed midtime) and use 80 sized needle (changed midtime). There was also a good lesson not to avoid fixing thread tension immediately, because it will backfire - a few parts were fixed manually because the upper thread was too loose and it came out.
Taking all this into consideration having a finished circle is not a bad achievement !
Block 4 - Sapphire Fire
Size is a circle in a 15"x15" square, so taking into consideration the small pieces, the material usage is 20"x15", which is cc 20cm of a fabric.