My puppy Xena (4 months) was scared of the blender too at first. When I put it on she was just outside relaxing and got a huge fright. After that if I brought it near her she would back away scared.
To help overcome her fear I would place the blender on the ground and with Xena leashed. I then would reward her for coming closer and closer and I would ignore any scared behaviour. After she got good at being around it I started to turn it on at the same time rewarding her.
After persisting at this she is now ok around the blender. But I still never put it on if she is nearby resting.
Hope I helped!
^^This is what I did with my late GSD, he was on the low threshold nerves side of things. He was scared of plenty of household stuff (vacuum cleaner, blender, hair dryer, etc) and some stuff he didn't seem to mind (lawn mower, leaf blower, etc). My other dog, before the shepherd, was TERRIFIED of the vacuum cleaner. Her choice was to try and viciously attack it though...ugh...So managing it with her was getting her to ignore it...down/stay that she got corrected for breaking when the vacuum was out, eventually she learned to ignore it. I can't find a household object that the new pup is afraid of. He doesn't even really want to inspect any of them, just is completely neutral/ignores them(he checked out the noisy vacuum cleaner, but decided it was just noisy and boring), which I love :-). It's a refreshing change of pace, I have never had a dog I haven't had to before.
I think the biggest thing is ignoring the fear, rewarding the courage (dog approaching the object) and hopefully (usually) the dog will stop fearing the inanimate object. It's also super common, like I said, up until this pup, every dog I had was scared of several of the things listed, including the blender, the worst was usually the vacuum, though. Good luck! :-D