Today I poured another cylinder head and bearing block. The casting quality continues to improve. Now that I've done a few pours, I've been noticing a few things: 1. I need to add water to the green sand much more often that I was expecting. I new the moisture would evaporate over time, but not to this extent. It's not a big deal though. Just add a little water and mix with a drill. 2. Draft is important. In areas where I didn't have draft (usually areas that don't matter or get cut off during machining) the sand breaks every time. I need to remember this as I create more patterns on the 3D printer. 3. Sand gets everywhere! I'm trying to improve my practices, but a sand dust is coating my garage. Today's pour completes the smaller cast parts. Now I have three large ones left: The Cylinder The Base The Flywheel Doing these larger castings I anticipate will be a challenge in itself. Happy modeling... ...Ved.