1) The heart block. I'm halfway through making these and still don't have the paper piecing template correct. Most of them I've just fudged and deemed the corners close enough. But with my latest change I managed to make the bottom points off by about 3/8"...it's really obvious when looking at it. (I put it in a red box below.) I'm ok with trial and error, but I don't know exactly what my problem is and I get so excited for each new revision only to have it let me down.
2) I didn't cut a long enough piece of batting for my Tetris quilt. I was looking at it this morning coming off the rollers and realized I was about 5" short. How in the world did that happen?!? After contemplating that for a bit I started coming up with ideas on how to fix it...take the whole quilt off (yuck), hand sew batting on (I'm terrible at hand sewing), put my other machine on the back table and work it across (maybe), or just put another piece of batting in and hope for the best (sounds good in theory). None of these sounded great, so I went with the most feasible...put my other machine on the back and walk it across.