Royal Mail letter size guide for medium printers
thingiverse
A quick guide to make sure your postage fits the size limits for letter and large letter sizes when posting though the Royal Mail in the UK. This is not the first one of these listed here. This one has been made smaller to allow it to be printed on a 250mm bed size (such as a Prusa i3 mk3s) rotated at an angle. I added a 6mm hole at one end so it can be hung at a packaging station. Nb. You will still need to check the weight of your letter. Letter should drop through the hole, not forced.
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