Summary

This is a replacement power button for the Kobo n647b e-reader. I printed it in pla, relatively slowly (it's a very small part so if you print too quickly the layers will stay too hot and it'll come out wobbly. I did use supports.

My power button was made of a grey rubber substance and it had perished and was squishy like blu-tack. I removed the grey rubber and have replaced with this button.

The Kobo n647b has a clamshell design, and I carefully popped mine open with a thin flat head screwdriver. You would probably get a better result with a proper spudger (I scratched the casing a little). then I popped the power button in through the top hole and added a bit of bathroom silicone sealant around it to make it a bit more springy and water-resistant. You might not even need to open up the front though, it may be possible to just pop the replacement button in through the power button hole.