The world has gone crazy about Fidget Spinners so, due to a number of requests, this allows for the weighting to be adjusted... and there's no need to buy a metal bearing as it's all 3D printed.
The Coin Fidget Spinner is an all 3D printed Fidget Spinner with the ability to add weight with coins and/or washers to achieve the best possible spin... fun to experiment with!
The interesting thing is that too much weight can slow the spin acceleration but too little weight reduces the spin time because there is not enough weight to maintain the momentum. Experiment with your spinner to find the ideal spin.
Add weight using coins or washers up to 22mm in diameter. It is also very important to apply a light (silicone or similar) lubricant to the moving surfaces as this will greatly improve the spin speed and duration... no different to a metal bearing a dry surfaces moving against another dry surfaces creates a lot of drag... lubrication fixes this.
Separate .stl files are provided fro the body, caps and shims as follows:
The body includes the 3D printed plastic bearing and body that holds the weights (coins and shims / spacers). You can print just the body and it will still function well as a spinner.
The caps (print 3) screw into the body and hold the weights and shims / spacers. You can print just the body and caps (no weights / shims) and it will spin well.
Shims / Spacers are provided in a range of thicknesses to ensure your 'weight stack' is tight and will not move around when spun. Any movement in the weights will affect the balance, spin speed and duration. The correct shim / spacer to use is the size that will make the weighting stack fractionally higher than the inner depth of the cap.
Please refer to the print settings and images for additional information... and post images of your Coin (Weighted) Fidget Spinners in action for other members to see!
Note: If you like this check out the rest of my fun and practical designs.
Easy prints but high fill recommended to ensure strength.
On a well set up, accurate, precise machine the centre bearing should free without much effort and the threaded parts screw together relatively easily. Be careful not to cross thread the caps... it is just PLA / plastic.
Lubricate, add weight and start spinning!
Firstly you need to gently free the centre bearing. Printed on a precise/accurate well set up machine, with a well sliced file, the bearing should break free with relatively little effort. Just push it up/down, wiggle and try to turn it until it starts moving. Turn it several times and it will free up further as small surface imperfections are smoothed through the movement.
Metal bearings require lubrication and this printed-in plastic bearing is no different in that respect. Lubricate the surfaces that run against each other with a lightweight silicone (or similar) lubricant to help your spinner spin as freely as possible with minimal drag.
Once lubricated add coin weights and shims / spacers evenly into the three weight holders and screw them into place. Make sure the shims / spacers used make the stack slightly high in the holder so the coins and shims / spacers are held firmly when the holders have been tightened in place. It is essential that the coins and spacers are held securely and can't move otherwise they will move during spinning and upset the balance. This will compromise the spin stability and duration.
Your Coin Weighted Fidget Spinner with continue to loosen through use so the spin rate and duration should improve through use as it is run in.
Experiment with your weighting to achieve the ideal weight that lets your Coin Weighted Fidget Spinner spin for the longest time possible.