Pull-String Gyroscope
Print Profile(1)
Description
Pull-String Top
This is a convenient and easy-to-print top toy that is driven by a gear rack and pinion, making it very entertaining.
Refer to the animated GIF in the model photos for assembly instructions.
When installing the top onto the launcher, do not apply excessive force, do not apply excessive force, do not apply excessive force, and do not insert it all the way in. The top should remain secure without falling.
Update on 11.20:
- A new pull-string model has been released. The launcher is now more robust and provides a more comfortable grip. We invite all our friends to download it: Pull-String Top V2 by Warmtech - MakerWorld
Several challenges were encountered during the model design process:
Initially, I intended to design the outer ring as a planetary gear. When the top rotates, the planetary gear would both revolve and rotate. However, due to some physical factors (which I am not entirely clear on), this structure could not spin.
The second design incorporated bearings, but it overlooked friction and inertia. The weight of the inner bearing ring was simply too small compared to the total weight of the object, resulting in negligible inertia, preventing it from spinning.
The third design encountered numerous issues, including but not limited to: an uncomfortable grip on the launcher, a wobbly pull-string, the top easily detaching from the launcher, and some parts requiring an interference fit. Most printers exhibit slight variations in precision. If it is too tight, it cannot be inserted; if it is too loose, it becomes ineffective...
Interference fit location:
Ultimately, it was decided to simplify the design. Let's get it launched first. This version of the top was designed.
The top's height was reduced, shifting its center of gravity downward, resulting in more stable rotation.
The launcher was redesigned, making it compact and convenient.
Designing is not easy. If you also like this model, please give it a thumbs up or support me. Thank you for your recognition and support!
If you have any questions or suggestions, please leave a comment below.
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License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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