DIY blender lid replacement

Any round piece of something that's reasonably solid will provide a start for a lid (think, arts and crafts store). Then trace around the top of the blender to see where the top of the container meets the lid. Then glue a foam-rubber gasket (DIY home store... windows) just inside the line and it should create a tight seal between the blender and the lid.

This will provide a makeshift but usable hold-while-in-use lid.

Cover with saran wrap and then put a kitchen towel on top of it. The kitchen towel may not be necessary.

Start your blender on the slowest setting, and then increase to desired speed. This will help minimize the splash that you get and decrease the need for a strong tight lid.

On the random/crazy side, I could almost imagine a partially deflated 4-square/kickball ball or similar rubber ball working.

You deflate it just enough so when you hold it on the top it forms to the shape of the opening.

It's rubber, so easy to wash.

Should be pretty cheap at a local sporting goods store.

I recommend taking the piece that you already have and applying very light, progressive layers of silicone sealant caulking to the edges to snuggie up the fit of the piece you already have. By progressive I mean put it down light, test it vigorously with dyed water to see where it is leaking, put a little more on those spots until it leaks no more. A tube should set you back about $4 and it's a permanent-temporary solution. The nice thing about this is that, if winter is coming up for you like it is for me you can then use the rest of the tube to draft-proof some windows.

A funnier way of doing this would be to try rubberizing memory foam.

I was searching for solutions for my own blender-with-a-lost-lid. What ended up working well for me was: I took a pair of waterproof hiking pants I had in my closet, draped a section of the waterproof garment over the top of the blender, used an elastic headband around the rim, and kept pulling the elastic headband tight as I blended with pulses to make sure it didn't get too out of control. Not the prettiest way to blend, but it didn't leak. I was only making margaritas, so I'm sure it'll wash out of that little section of my hiking pants (which don't need to be pristine anyway). Cheers!

I have exactly the same problem with the same blender. I had it for 12 years, and I use it every weekday morning to make smoothies. I use a flat lid from a 'disposable' ziplock brand plastic container. Use a lid from any plastic container that's larger than the diameter of the glass blender jar. It must be flat, not ribbed; otherwise, you don't get a seal.