Most of my friends may have the impression that we have reported that 3D printing enthusiasts have designed and produced machine guns that can fire rubber band bullets. This is a very fun toy that can continuously emit several or even dozens in a short time. Strip rubber band. Because of its fun and interesting, it has also attracted many makers to constantly improve on it.
For example, recently, on the Instructables of the DIY hot station, a user with the ID mdavisgtm shared his fully automatic Arcus Gatlin rubber band machine gun, which can fire 48 rounds in a few seconds. It is reported that it is actually using the energy of the last shot to rotate the shooting barrel to the unknown of the next round. In addition, it has a cool arm bracket and cam system.
If you are a 3D printing purist, you will be happy to see that the entire unit can easily combine 33 3D printed parts without any screws or glue.
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Of course, this means a lot of 3D printing jobs. Some parts need to be set to a 100% fill rate (mostly 25%), and the features need to set the print layer height to 0.15 mm. So, if you want to have such a cool rubber band machine gun, you should be prepared to pay for it for many hours, or even several days of 3D printing time.
However, in my experience, projects like this need to set the layer height to 0.15 mm very little, so if you are willing to sacrifice a little surface quality in exchange for faster 3D printing speed, you can set the layer resolution. Not so fine.
In the tutorial, mdavisgtm uses an Ultimaker 2 3D printer , but in fact, any 3D printer with a production area of ​​200 mm × 200 mm can produce all the required parts.
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