This is a cloud and thunder concept. The cloud is "floating" in your wall and your key is hanging from the thunder keychain. Hole distance to hang it is 50 mm Thunder keychain hole 2.5 mm Cloud hole: 3mm high, 50 mm wide. In the picture you see that inside the keychain is a nut, in order to work well you can use a neodymium magnet, but be careful, it might harm your electronic devices like cellphone. You can also use strong neodymium magnets inside the cloud. The thunder was printed with 2 shells, 0% infill in order to drop the nut. Use bottom / top fill of 1.2 or any good bridge configuration to fill the top layer well.