In this step I will be explaining how you can apply a custom geometric pattern using a Voronoi Addin for Fusion 360. I first had to decide the parameters of the Voronoi generator, and since I wanted a large selection of shapes I chose a 15 x 15 cm square with 100 rounded shapes. I first made sure that the generated Voronoi sketch was on the same axis as my spinner sketch, and then I started dragging shapes from the generated sketch onto my model. I had spent hours adjusting every single shape in order to make sure it was the right size and that it fit into a visually appealing pattern. I also had to make sure that the designs all had the same number of equally sized holes in order to take balance into effect. Using such an irregular Voronoi pattern will lead to a slightly unbalanced fidget spinner, so I then used an awesome feature included in Fusion 360, which is the Center of Mass selection. Simply use this tools and select your spinner model, and it will give the center of mass of your spinner. If the center of mass is too far off, you can go back into your sketch and start tweaking the shapes until you can balance out the model.
The next step in Fusion 360 is to extrude your plane into a three dimensional model to print. I extruded the sketch slightly larger than the width of my bearing, which came to 5.5 millimeters thick. I found during my test models that this is a good thickness to spin and handle. I next filleted the edges of the exterior of the model and the Voronoi pattern in order to make the model more ergonomic and easier to hold and fidget with.
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Overall I am thrilled with the way this spinner turned out, and the cast metal gives it a really good weight! By using Fusion 360, I was able to model it perfectly, and I also had a phenomenal metal cast which also kept it balanced. I love the metal and the Voronoi pattern, and I am thrilled with the way it turned out since it was my first time ever designing a 3D model for my new printer!
Thank you!
Brandon
I have recently been learning how to use Fusion 360 on the Instructables class, though up until now I have only designed very simple parts. This Instructable should show you how to model and build your own fidget spinner. If you are unfamiliar with Fusion, I highly recommend getting started with the Instructables 3D Printing Class.
Next, we need to make a circle with the same diameter directly 30mm above the first circle. You can align the circles by using the "Horizontal/Vertical" constraint. To set the distance between the circles I used the "Sketch Dimensions" tool. You can change the distance based on your size preference.
Using the circular pattern tool, select the upper circle as the "Object" and the center point of the lower circle as the "Center Point". There should now be 3 circles around the center circle. While the "Circular Pattern" menu is still open, you can change how many outer circles you want.
The pennies have a slightly smaller diameter than the bearings. They have a diameter of 19.05mm and a thickness of 1.52mm. This means you can fit 4 pennies in the height of a bearing. I will cover this more in Step 5. Make a circle with a diameter of 19.05mm, 32.95mm above the center circle. You can align the circles by using the "Horizontal/Vertical" constraint. To set the distance between the circles I used the "Sketch Dimensions" tool. You can change the distance based on your size preference.
Just like with bearings, create a 3mm offset on both of the circles, and then use the circular pattern tool to repeat the penny circle around the center bearing circle. (See above in the Bearing section for more information)
Hex nuts make great fidget spinner weights. I recommend using M12. They have a diameter of 20.03mm and a height of roughly 10.45mm. This makes them somewhat protrude from the fidget spinner but they only pop up a little bit so I didn't really notice the difference. Use the circumscribed polygon tool to make a 20.03mm hexagon. It needs to be directly 32mm above the center. You can align the circles by using the "Horizontal/Vertical" constraint. To set the distance between the circles I used the "Sketch Dimensions" tool. You can change the distance based on your size preference.
I have attached some screenshots of my designs to give you ideas. Try experimenting by adding more lines or circles (See Image 4). If your pattern is too complex to repeat 3 or more times, try using the circular pattern tool to complete the whole pattern (I did this in Image 5). You can even try changing to offset for a different look; I did this in Image 5 to make all the circles touch.
As a rule of thumb, you can't extrude the 22mm circles(inner circles) unless you are using pennies on the outside; you need to extrude the offsets which will encase the bearings. Also you need to extrude something to connect all the circles. Keep in mind that you don't need to extrude everything; the gaps and spaces make cool patterns.
If you want your fidget spinner to use pennies you do need to extrude the 19.05mm circles(inner circles). You need to extrude them by .5mm while using the two sides option under "Direction". This will provide a surface to glue the pennies to. If your fidget spinner will use hex nuts, you can extrude it the same way as if you were to use bearings.
If you made a more geometric design you could just add a small fillet (See Image 4). You could also do a small chamfer around the whole design as well. These are just a few variations that I liked. Feel free to experiment with the Fillet, Chamfer, and Rule Fillet tools to customize the model to your likes. You can even use the Press Pull tool to modify your design.
The first step is to make the inner and outer rings of the bearing, a component. To do this first find out which body the inner and outer rings are (they should be Body 1 and Body 2). Next, for each of the bodies, right click on them and click "Create Components from Bodies" in the menu that pops up. Now the inner and outer bearing rings should be components.
Next, you should create a rigid group between the fidget spinner body and the outer ring of the bearing. This will make the fidget spinner body move when the bearing moves without combining the two objects. To do this first click on "Rigid Group" under "Assemble". Then select the outer ring component and the fidget spinner body component. There should now be a rigid group created.
Designing the caps is fairly straightforward. The ones I have designed are press fit.Again, keep in mind that the bearing has an inner diameter of 8mm, an outer diameter of 22mm and a height of 7mm. I found it easier to make the caps in a new file.
First make an 8mm circle. Using the same center, make a 22mm circle. The 8mm circle will go inside the inner ring of the bearing. Make a 1mm offset on the inner circle. This will provide some padding for the cap to lie on the inner bearing ring.
The sketch will now be hidden, so make sure to unhide it. Now extrude the center most circle by 3.5mm (This is so each cap won't take up more than half of the height). Lastly extrude the middle circle by .5mm. While extruding make sure you select "Join" under the "Extrude" menu. This will make the cap a single body.
Now you should have a basic cap design. To make it fully functional (and a bit better) you need to modify it slightly. Here you can customize the cap to your taste. I added a 2mm "Fillet" to the top cap portion so that it looked better and so that is was easier to hold. Finally, I added a .5mm "Chamfer" to the portion that goes inside the bearing, so that the cap could be easily pressed into the bearing.
To export the 3D model. right click on the fidget spinner body and select "Save as STL". When slicing, keep in mind that higher infill will make the spinner spin longer since it will be more heavy. On my school's Makerbot, it took 30-45 minutes based on the spinner when printing at normal resolution.
If your 3D printer cannot print dimensionally accurate you will need to scale your STL up or down by 1% while slicing. At first when I was testing my design on my library's printer, I had to scale down the model by 1% to make the bearings fit tightly.
The first step is to pry open the bearing caps with a screwdriver. You may need to work the screwdriver a little bit until it is able to get under the bearing cap. Be sure to remove the bearing caps on both sides of the bearing.
You probably notice that the bearings are very greasy. Squirt a few drops of the degreaser into a cup of water and let the bearings sit in the solution for a few minutes. After this, you should see a noticeable difference in the amount of time the bearing spins.
This part is fairly straightforward. All you need to do is put the bearings into the holes on the fidget spinner and then put on the spinner caps. You may be able to push the bearings in without any tools (I was able to do this for one hole), but for most of them I had to use a hammer. For the spinner caps, you should be able to push them in with your hands. If you have a vise I recommend using it instead of a hammer since it won't leave any marks on your spinner.
If you are using pennies, you need to superglue the pennies into the outer circles. You should be able to fit 4 pennies into each circle. If you are using hex nuts, all you need to do is hammer the hex nuts into the outer hexagons.
Congratulations! You just designed and constructed your own fidget spinner! After a while of spinning it,the bearings should be broken in and the fidget spinner should spin much longer. Mine spins for almost two minutes.
If you have any questions or feedback please comment down below. I'd love to see what other people make. Also, if you enjoyed this tutorial or found it helpful please vote for me in the contest. Thank you! 152ee80cbc
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