I used a laser cutter, but if you can’t find a laser cutter to use, you could cut a square and then cut off the corners with straight diagonal cuts. It’s easy to get the shape right because the top of Blendtec jars are square with rounded corners. The inner piece keeps the walls of the jar from bowing in, and the top piece seals over a flat gasket. I then attach that piece to a larger piece of acrylic. My solution is to cut a second piece of acrylic that just fits inside the top of the Blendtec jar. This makes the top of the jar no longer flat, and it starts leaking. As they bow in, the middle of the wall tops move down slightly, while the corners stay in place. However, under vacuum, the walls of the jar bow in. The tops of Blendtec jars are flat, so my first idea was to simply seal it with a gasket and a flat piece of acrylic. I confirmed that the Blendtec bearing seal holds up to the vacuum, as no air bubbles come in the bottom in a vacuumed container of water. That said, I haven’t encountered any problems resulting from vacuum blending. Note: this sort of DIY approach likely voids the Blendtec warranty. Do you want to convert your Blendtec blender into a vacuum blender? If so, this post is for you! My first Blendtec vacuum lid didn’t work, but this second-generation design works perfectly.
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