{"data":{"contests":[{"id":"518","slug":"cap-hacks","name":"Cap Hacks","teaserImageFilePath":"media/competition/teaser_images/None/small_banner_caps.jpg","description":"### **\ud83c\udfc1 Starting: July 10, 2026, Ending: July 26, 2026 23:59 UTC.**\r\n\r\n### **\ud83d\udcc5 Entries: from June 10, 2026 to July 26, 2026 23:59 UTC.**\r\n
\r\nWe\u2019re staying with the summer theme for one more flash contest. This time, we\u2019re focusing on baseball caps: simple summer gear with plenty of room for small 3D printed upgrades.\r\n\r\nDesign a 3D printable add-on, fix, holder, or decoration for a cap. It can help with storage, adjust the fit, modify the brim, extend the back strap, or add something unnecessary (like a tiny propeller). \r\n\r\nKeep it printable, wearable, and clear about what type of cap it fits. If your model needs a something specific like a flexible filament, magnets, clips, or something else, mention it in the description.\r\n
\r\n
\r\n### \ud83d\udcf8\u2b50 Hero model of this contest: [Hat Hanger Clip](https://www.printables.com/model/88168-hat-hanger-clip)","isOpen":true,"openFrom":"2026-07-10T09:30:41+00:00","openTo":"2026-07-26T22:59:00+00:00","modelsCount":30,"winnerPrize":"500 Prusameters which are more than enough for one Prusament spool. The winner will also receive the Printables honorary badge, and up to 900 Prusameters will be distributed among other top entries.","entryLink":"","winnersLink":"","printDateValidation":"2026-06-10T00:00:00+00:00","signedModelsCount":null,"maxModelsPerUser":5,"aiGeneratedPrintsDisabled":true,"__typename":"CompetitionType"},{"id":"516","slug":"designer-challenge-modular-drawer-system","name":"Designer challenge: Modular Drawer System","teaserImageFilePath":"media/competition/teaser_images/516/img_6841.jpg","description":"
\r\n### **\ud83c\udfc1 Starting: July 01, 2026, Ending: July 22, 2026 23:59 UTC.**\r\n\r\n### **\ud83d\udcc5 Entries: from June 01, 2026 to July 22, 2026 23:59 UTC.**\r\n
\r\n\r\n### First place:\r\n* [Original Prusa MK4S kit](https://www.prusa3d.com/product/original-prusa-mk4s-3d-printer-kit/),\r\n\r\n### Second place:\r\n* 1050 Prusameters.\r\n\r\n### Third place:\r\n* 700 Prusameters.\r\n\r\nThis is the first-ever Designer Challenge on Printables, created together with our June Designer of the Month, [Matthew_Ghost](https://www.printables.com/@Matthew_Ghost)!\r\n\r\nEach Designer of the Month chooses a theme for a three-week community contest and after the contest ends, the designer helps us pick the winners.\ud83c\udfc6\r\n\r\nWant to learn more about the designer behind the challenge? Read the[ full interview here.](https://www.printables.com/article/designer-of-the-month-july-157J8MN)\r\n\r\n
\r\n\r\n## The first designer challenge: modular drawer system\r\n\r\nYour system should let users build their own setup from separate drawer modules.\r\n\r\nThe design can include stackable drawers, side-by-side connections, pegboard mounts, desk attachments, or extra add-ons that can be printed later. Different drawer sizes, label holders, interchangeable parts, mounting options, and expansion pieces are all welcome.\r\n\r\nYou can also experiment with the opening mechanism. A simple handle works, as does a sliding latch, a push-push lock, or another solution.\r\n\r\nThe important part is that the design stays modular and expandable. Users should be able to adapt it to their own workspace.\r\n\r\n
\r\n### \ud83d\udcf8\u2b50 Hero model of this contest: [Skadis Modular Storage Organizer](https://www.printables.com/model/1729887-skadis-modular-storage-organizer-storage-box)","isOpen":true,"openFrom":"2026-07-01T09:32:16+00:00","openTo":"2026-07-22T22:59:00+00:00","modelsCount":125,"winnerPrize":"Original Prusa MK4S kit, and more than 1750 Prusameters in total!","entryLink":"","winnersLink":"","printDateValidation":"2026-06-01T00:00:00+00:00","signedModelsCount":null,"maxModelsPerUser":5,"aiGeneratedPrintsDisabled":true,"__typename":"CompetitionType"},{"id":"517","slug":"clog-charms","name":"Clog Charms","teaserImageFilePath":"media/competition/teaser_images/None/small_banner_clog-charms.jpg","description":"### **\ud83c\udfc1 Starting: June 26, 2026, Ending: July 12, 2026 23:59 UTC.**\r\n\r\n### **\ud83d\udcc5 Entries: from June 01, 2026 to July 12, 2026 23:59 UTC.**\r\n
\r\nIt\u2019s hot, summer holidays are starting, and clog-style shoes are about to show up in gardens everywhere. They\u2019re comfortable, but they could use a little personality.\r\n\r\nFor this flash contest, design a small 3D printable charm that snaps into the holes of clog-style shoes. You can use whatever style you like; the important part is that it prints well, stays in place, and makes sense on a shoe.\r\n\r\nIf your model needs a specific size, flexible filament, or a tested print orientation, don\u2019t forget to mention it in the description.\r\n
\r\n
\r\nLet\u2019s get ready for barbecue season!\r\n
\r\n
\r\n### \ud83d\udcf8\u2b50 Hero model of this contest: [Iconic London Tube Sign Jibbit Croc Charm](https://www.printables.com/model/1737859-iconic-london-tube-sign-jibbit-croc-charm)","isOpen":true,"openFrom":"2026-06-26T15:43:27+00:00","openTo":"2026-07-12T22:59:00+00:00","modelsCount":284,"winnerPrize":"Eternal glory, 500 Prusameters which are more than enough for one Prusament spool. The winner will also receive the Printables honorary badge, and up to 900 Prusameters will be distributed among other top entries.","entryLink":"","winnersLink":"","printDateValidation":"2026-06-01T00:00:00+00:00","signedModelsCount":null,"maxModelsPerUser":5,"aiGeneratedPrintsDisabled":false,"__typename":"CompetitionType"}]}}

Royal Mail Letter / Parcel Sizing Guide

Model files

Royal Mail Guide stl

Royal Mail Guide stl

Model origin

License

Royal Mail Guide
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Royal Mail Guide
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