Modern marble locks are one of the most common mechanical devices in the world, but few people really know how they work. The design was first patented in 1848, but in theory it dates back to 4,000 BC in ancient Egypt. It is still the most common way to protect people's portals to date. The mechanism uses springs to load pins of different lengths and cannot be opened if you do not use the correct key. Modern keys are usually flat and cut into a zigzag shape to match the exact length of each pin in the lock so that the lock can be opened.
This design is so effective that it has been ubiquitous in 150 years and is expected to continue in the long run. But like almost any mechanical device, safety does not necessarily mean it is unbreakable. There are such a group of people in the world who regard shackles as an interesting activity. These people do not shackle for some illegal purpose, but regard it as a hobby, just for fun. Learning to open a lock without a key is often used by fans as a game, a puzzle that needs to be uncovered.
Ceravyn (or Sara) from Finland is such a fan. She also admitted that it was purely because of her own boring. But slowly, this boring pastime quickly became a pleasure, a random skill she could learn on her own. Ceravyn said she likes to explore how things work and why they work. She found that the best way to find the answer is to take things apart and see what's going on inside.
But this time, because he owns a Prusa i3 style 3D printer , Sara decided to design and 3D print a conceptual type of pin lock device. In order to explore how it works, her 3D printing studio will open a window to make the internal operation of the marble body clearly visible, allowing people to intuitively understand how it works, or it can be used to improve people's Unlock skills. Of course, Sara's intention is not the latter. She is still in the process of learning 3D printing and 3D modeling . The production of this marble lock mechanism is also to practice my hobby. Sara said that so far this is perhaps the most complicated model she has ever created.
All parts of the model, including the plug and the outer casing, were printed using PLA material at a fill rate of 10% and a layer height of 0.2 mm. For the drive pins and key pins, the layer height is set to be smaller by 0.1 mm because of their smaller size and higher precision requirements. As for the spring, she used it from the ballpoint pen. This model does not include the key because it is mainly for practicing keyless unlocking. But if you want to print a usable key in 3D, it's not a bad idea.
Although Sara is currently learning how to use 3D printers, she has known this technology for several years. The first time she saw a 3D printer was at a local maker event, a new Mendel 3D printer. But until last summer, when she discovered the hacker space Helsinki HackLab, she decided to build a 3D printer and explore 3D design.
Her first major design and 3D printing project was the marble lock device, which used Solidworks. Previously, she did not have formal 3D modeling or CAD training. She relied on the teaching videos and other online resources on the Internet. It took her about three hours to complete the design. Although she was very satisfied with the result, she said that she still has a lot to learn.
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