3D Printed Letter Sizer | Royal Mail Large Letter & Letter Size Guide | Parcel Measuring Tool

Take the guesswork out of posting your orders with this 3D Printed Letter Sizer, designed to help small businesses, Etsy sellers, Vinted sellers and online shops quickly check whether their parcels qualify as a Letter or Large Letter before heading to the Post Office.

Perfect for packaging greetings cards, prints, stickers, bookmarks, decals, stationery, craft supplies and other flat items, this durable sizing tool helps you avoid unexpected postage costs.

✨ Features

• ✔️ 3D printed in durable PLA
• ✔️ Checks both Letter and Large Letter sizes
• ✔️ Clearly engraved measurements
• ✔️ Lightweight yet sturdy
• ✔️ Rounded corners for comfortable handling
• ✔️ Ideal for home businesses and online sellers

📏 Size Guide

Large Letter

• Maximum: 35.3cm × 25cm
• Maximum thickness: 2.5cm

Letter

• Maximum: 24cm × 16.5cm
• Maximum thickness: 0.5cm

Simply slide your packaged item through the correct slot. If it fits comfortably, it falls within the corresponding Royal Mail size guidelines.

Perfect For

• Etsy sellers
• Shopify businesses
• Vinted sellers
• eBay sellers
• Handmade businesses
• Small business owners
• Craft businesses
• Print shops
• Sticker businesses
• Greeting card makers

A must-have desk accessory that saves time, reduces postage mistakes and makes packing orders quicker and easier.

Please note: Colours may vary slightly due to filament availability. As each item is 3D printed, minor layer lines are a normal characteristic of the manufacturing process and do not affect functionality.