Create a page at Textpage.net and then upload manuals of your electronic (or other) devices to it, each as block type “Image or file”.
Click the little share icon underneath each block to generate a QR code pointing to it.
Print this QR code and attach it directly to the device, e.g. to your washing machine.
In case you need to read the manual, just scan that QR code with your mobile phone and you will be led directly to the manual at your page!
See an example here (only in German, though).