Answers.Body: <p>If we're going to mention much larger spheres and sphere-like objects (and I don't see why not), there's also:</p>
  <ul>
  <li><a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=60934" rel="noreferrer">60934</a> Bionicle Tridax Pod Half</li>
  </ul>
  <p><a href="https://i.sstatic.net/DNbXQ.png" rel="noreferrer"><img src="https://i.sstatic.net/DNbXQ.png" alt="60934" /></a></p>
  <ul>
  <li><a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=61287" rel="noreferrer">61287</a> Cylinder Hemisphere 2 x 2 with Cutout (I know it as Jack Sparrow's globe)</li>
  </ul>
  <p><a href="https://i.sstatic.net/5qZI0.png" rel="noreferrer"><img src="https://i.sstatic.net/5qZI0.png" alt="61287" /></a></p>
  <ul>
  <li><a href="https://www.bricklink.com/v2/search.page?q=98107*" rel="noreferrer">98107</a> Cylinder Hemisphere 11 x 11, Studs on Top (usually decorated)</li>
  </ul>
  <p><a href="https://i.sstatic.net/V1nXP.png" rel="noreferrer"><img src="https://i.sstatic.net/V1nXP.png" alt="98107" /></a></p>
  <ul>
  <li><a href="https://www.bricklink.com/v2/catalog/catalogitem.page?G=852171" rel="noreferrer">852171</a> Phantoka Ball Shooter, along with <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?G=852279" rel="noreferrer">852279</a> Accessory Pack EVA Balls (neither of which I'd ever known of before today)</li>
  </ul>
  <p><a href="https://i.sstatic.net/ycveF.png" rel="noreferrer"><img src="https://i.sstatic.net/ycveF.png" alt="852171" /></a></p>
  <p><a href="https://i.sstatic.net/8kmZx.png" rel="noreferrer"><img src="https://i.sstatic.net/8kmZx.png" alt="852279" /></a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-06-06T23:25:55.637Z
Answers.Text: If we are wanting to be comprehensive, there is also the [Magnet Ball](https://www.bricklink.com/v2/catalog/catalogitem.page?P=bb0188), [Technic Ball Joint](https://www.bricklink.com/v2/catalog/catalogitem.page?P=32474) (I know you mentioned in your comment), [Technic Ball Steel](https://www.bricklink.com/v2/catalog/catalogitem.page?P=99948), and [two of these halves](https://www.bricklink.com/v2/catalog/catalogitem.page?P=44359) can be connected with a tyre.
Answers.UserDisplayName: Matthew Jensen
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-06-08T03:14:31.017Z
Answers.Text: @MatthewJensen oops, I forgot about the Magnet Ball (which I think I have from some portion of that Harold Potter set) and the Ball Turret half. But those Steel Ball pieces were a surprise! I wonder how many GBC components one of **those** would destroy.
Answers.UserDisplayName: RSchulz
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-06-08T04:52:31.397Z
Answers.Text: The magnet ball could be interesting for GBC's, being weighted to one side to potentially make some cool kinetic effects. One could maybe design a 'stronger' GBC layout for the steel guys!
Answers.UserDisplayName: Matthew Jensen
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-06-21T23:28:01.320Z
Answers.Text: I wonder if I should include the Jurassic World Gyrosphere <https://www.bricklink.com/v2/catalog/catalogitem.page?P=20455>
Answers.UserDisplayName: RSchulz
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-06-05T04:49:42.790Z
Answers.LastActivityDate: 2022-06-05T04:49:42.790Z
Answers.UserDisplayName: RSchulz
Answers.Body: <p>Also Lego set 7029 has a plastic &quot;boulder&quot; that could be an option.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-06-06T02:52:07.483Z
Answers.Text: I looked at the inventory on BrickLink.com, and the only sphere is the Zamor sphere that Sander De Dycker already mentioned. There's the Technic "ball", but it's rather non-spherical, so I didn't include it in my answer either. Or are you thinking of some other piece?
Answers.UserDisplayName: RSchulz
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-06-06T02:38:09.910Z
Answers.LastActivityDate: 2022-06-06T02:38:09.910Z
Answers.UserDisplayName: dew
Answers.Body: <p>There are several ball designs that fit your needs (and are commonly used for GBC machines) - a selection :</p>
  <ul>
  <li><a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=x45" rel="noreferrer">Ball, Sports Soccer Plain</a>, and their various multi-colored variants (eg. <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=x45pb03" rel="noreferrer">Ball, Sports Soccer with Standard Pattern</a>) (14.2 mm diameter ; 1.75 studs)</li>
  </ul>
  <p><a href="https://i.sstatic.net/Y3k7D.png" rel="noreferrer"><img src="https://i.sstatic.net/Y3k7D.png" alt="enter image description here" /></a>
  <a href="https://i.sstatic.net/8eezk.png" rel="noreferrer"><img src="https://i.sstatic.net/8eezk.png" alt="enter image description here" /></a></p>
  <ul>
  <li><a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=43702pb02" rel="noreferrer">Ball, Sports Basketball with Standard Black Lines Pattern</a> (14.2 mm diameter ; 1.75 studs)</li>
  </ul>
  <p><a href="https://i.sstatic.net/Ff9nW.png" rel="noreferrer"><img src="https://i.sstatic.net/Ff9nW.png" alt="enter image description here" /></a></p>
  <ul>
  <li><a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=54821" rel="noreferrer">LegoBall, Bionicle Zamor Sphere</a>, and their various multi-colored variants (eg. <a href="https://www.bricklink.com/v2/catalog/catalogitem.page?P=54821pb04" rel="noreferrer">Ball, Bionicle Zamor Sphere with Marbled Yellow Pattern</a>) (16.5 mm diameter ; 2 studs) - note these aren't as commonly used for GBC machines as the others, but I've included them since they fit your size needs better.</li>
  </ul>
  <p><a href="https://i.sstatic.net/x4Rh9.png" rel="noreferrer"><img src="https://i.sstatic.net/x4Rh9.png" alt="enter image description here" /></a>
  <a href="https://i.sstatic.net/EP2fK.png" rel="noreferrer"><img src="https://i.sstatic.net/EP2fK.png" alt="enter image description here" /></a></p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-06-04T16:16:31.023Z
Answers.Text: These are larger than the question was asking for, but for completeness it's also worth mentioning [the larger 6.5 stud duplo balls](https://www.bricklink.com/v2/catalog/catalogitem.page?P=41250&idColor=86#T=C&C=86), most famously used with an Indiana Jones set to recreate an iconic scene from Raiders of the Lost Ark.
Answers.UserDisplayName: Nathan Stohlmann
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-06-04T17:56:10.030Z
Answers.Text: @Nathan, perhaps add this as an answer ? Also note that the duplo balls come in robotic and education sets...
Answers.UserDisplayName: Michael Verschaeve
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-06-05T08:55:20.340Z
Answers.Text: I had no idea I had so many options. I've never been into Bionicle stuff so I had no idea these existed, but the Bionicle balls fit my use-case perfectly as I'm currently using 16-17mm glass marbles. And they are readily and cheaply available on BrickLink in a whole range of marble-like color-patterns.  I've just ordered a whole bunch of them.
Answers.UserDisplayName: Tonny
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-06-08T03:16:05.830Z
Answers.Text: Yeah, I assume I am not alone wishing the GBC standard had called for the much cheaper Zamor spheres. I still regret not buying just a **boatload** of basketballs when I saw them in a bin at LegoLand California about a decade ago.
Answers.UserDisplayName: RSchulz
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2022-06-04T13:44:20.690Z
Answers.LastActivityDate: 2022-06-04T14:02:50.430Z
Answers.LastEditDate: 2022-06-04T14:02:50.430Z
Answers.UserDisplayName: Sander De Dycker
Body: <p>I recently started experimenting with GBC machines build out of LEGO.</p>
  <p>Ball bearings are ideal as balls (have a lot of momentum due to their weight), but are also impacting on the LEGO bricks hard enough that (eventually) they make the plastic crack. (This limits what you can do in the GBC design. You need to avoid large drops or high-speed bumps into end-stops.)</p>
  <p>So I'm currently using glass marbles for balls at the moment.</p>
  <p>Ideally I would like to use LEGO for the balls.<br />
  I realize they would be very lightweight which poses some design issues for some of the mechanisms, but finding solutions to that is part of the fun.</p>
  <p>Unfortunately I don't seem to be able to find either single piece LEGO balls or sets of multiple LEGO pieces (like 2 half-domes) that together form a proper ball.</p>
  <p>I'm looking for a ball shape with a diameter of at least 2 studs. (Between 2 and 3 studs would be perfect for my purpose, but somewhat larger would be fine too.)<br />
  I'm OK with something that has a hole into which an axle, pin or stud can be fitted.<br />
  I'm NOT OK with a stud sticking out, because that would affect the rolling behavior too much. A recessed stud that doesn't stick out beyond the outline of the sphere would be OK.</p>
  <p>If a true ball/sphere is possible in LEGO, what piece(s) do I need ?</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-06-05T22:10:24.353Z
Comments.Text: Defining "GBC machine" in the question may be helpful. Searching implies "Great Ball Contraption."
Comments.UserDisplayName: Aaron D. Marasco
Tags: <piece-information><shapes><gbc>
Title: Is there a true ball/sphere LEGO piece (or pieces that together form a ball/sphere)?
UserDisplayName: Tonny
ThreadText: # Is there a true ball/sphere LEGO piece (or pieces that together form a ball/sphere)?
  
  (Asked by: username_0 on 2022-06-04)
  
  I recently started experimenting with GBC machines build out of LEGO.
  
  Ball bearings are ideal as balls (have a lot of momentum due to their weight), but are also impacting on the LEGO bricks hard enough that (eventually) they make the plastic crack. (This limits what you can do in the GBC design. You need to avoid large drops or high-speed bumps into end-stops.)
  
  So I'm currently using glass marbles for balls at the moment.
  
  Ideally I would like to use LEGO for the balls.  
  I realize they would be very lightweight which poses some design issues for some of the mechanisms, but finding solutions to that is part of the fun.
  
  Unfortunately I don't seem to be able to find either single piece LEGO balls or sets of multiple LEGO pieces (like 2 half-domes) that together form a proper ball.
  
  I'm looking for a ball shape with a diameter of at least 2 studs. (Between 2 and 3 studs would be perfect for my purpose, but somewhat larger would be fine too.)  
  I'm OK with something that has a hole into which an axle, pin or stud can be fitted.  
  I'm NOT OK with a stud sticking out, because that would affect the rolling behavior too much. A recessed stud that doesn't stick out beyond the outline of the sphere would be OK.
  
  If a true ball/sphere is possible in LEGO, what piece(s) do I need ?
  
  **Tags:** piece-information, shapes, gbc
  > **Comments:**
  > **username_1**: Defining "GBC machine" in the question may be helpful. Searching implies "Great Ball Contraption."  
  
  ---
  
  ## 3 answers
  
  ### Answer by username_5 on 2022-06-04. Score: 8 | Accepted answer
  
  There are several ball designs that fit your needs (and are commonly used for GBC machines) - a selection :
  
  * [Ball, Sports Soccer Plain](https://www.bricklink.com/v2/catalog/catalogitem.page?P=x45), and their various multi-colored variants (eg. [Ball, Sports Soccer with Standard Pattern](https://www.bricklink.com/v2/catalog/catalogitem.page?P=x45pb03)) (14.2 mm diameter ; 1.75 studs)
  
  [![enter image description here](https://i.sstatic.net/Y3k7D.png)](https://i.sstatic.net/Y3k7D.png)
  [![enter image description here](https://i.sstatic.net/8eezk.png)](https://i.sstatic.net/8eezk.png)
  
  * [Ball, Sports Basketball with Standard Black Lines Pattern](https://www.bricklink.com/v2/catalog/catalogitem.page?P=43702pb02) (14.2 mm diameter ; 1.75 studs)
  
  [![enter image description here](https://i.sstatic.net/Ff9nW.png)](https://i.sstatic.net/Ff9nW.png)
  
  * [LegoBall, Bionicle Zamor Sphere](https://www.bricklink.com/v2/catalog/catalogitem.page?P=54821), and their various multi-colored variants (eg. [Ball, Bionicle Zamor Sphere with Marbled Yellow Pattern](https://www.bricklink.com/v2/catalog/catalogitem.page?P=54821pb04)) (16.5 mm diameter ; 2 studs) - note these aren't as commonly used for GBC machines as the others, but I've included them since they fit your size needs better.
  
  [![enter image description here](https://i.sstatic.net/x4Rh9.png)](https://i.sstatic.net/x4Rh9.png)
  [![enter image description here](https://i.sstatic.net/EP2fK.png)](https://i.sstatic.net/EP2fK.png)
  
  > **Comments:**
  > **username_6**: These are larger than the question was asking for, but for completeness it's also worth mentioning [the larger 6.5 stud duplo balls](https://www.bricklink.com/v2/catalog/catalogitem.page?P=41250&idColor=86#T=C&C=86), most famously used with an Indiana Jones set to recreate an iconic scene from Raiders of the Lost Ark.  
  > **username_7**: @Nathan, perhaps add this as an answer ? Also note that the duplo balls come in robotic and education sets...  
  > **username_0**: I had no idea I had so many options. I've never been into Bionicle stuff so I had no idea these existed, but the Bionicle balls fit my use-case perfectly as I'm currently using 16-17mm glass marbles. And they are readily and cheaply available on BrickLink in a whole range of marble-like color-patterns.  I've just ordered a whole bunch of them.  
  > **username_2**: Yeah, I assume I am not alone wishing the GBC standard had called for the much cheaper Zamor spheres. I still regret not buying just a **boatload** of basketballs when I saw them in a bin at LegoLand California about a decade ago.  
  
  ---
  
  ### Answer by username_2 on 2022-06-05. Score: 6
  
  If we're going to mention much larger spheres and sphere-like objects (and I don't see why not), there's also:
  
  * [60934](https://www.bricklink.com/v2/catalog/catalogitem.page?P=60934) Bionicle Tridax Pod Half
  
  [![60934](https://i.sstatic.net/DNbXQ.png)](https://i.sstatic.net/DNbXQ.png)
  
  * [61287](https://www.bricklink.com/v2/catalog/catalogitem.page?P=61287) Cylinder Hemisphere 2 x 2 with Cutout (I know it as Jack Sparrow's globe)
  
  [![61287](https://i.sstatic.net/5qZI0.png)](https://i.sstatic.net/5qZI0.png)
  
  * [98107](https://www.bricklink.com/v2/search.page?q=98107*) Cylinder Hemisphere 11 x 11, Studs on Top (usually decorated)
  
  [![98107](https://i.sstatic.net/V1nXP.png)](https://i.sstatic.net/V1nXP.png)
  
  * [852171](https://www.bricklink.com/v2/catalog/catalogitem.page?G=852171) Phantoka Ball Shooter, along with [852279](https://www.bricklink.com/v2/catalog/catalogitem.page?G=852279) Accessory Pack EVA Balls (neither of which I'd ever known of before today)
  
  [![852171](https://i.sstatic.net/ycveF.png)](https://i.sstatic.net/ycveF.png)
  
  [![852279](https://i.sstatic.net/8kmZx.png)](https://i.sstatic.net/8kmZx.png)
  
  > **Comments:**
  > **username_3**: If we are wanting to be comprehensive, there is also the [Magnet Ball](https://www.bricklink.com/v2/catalog/catalogitem.page?P=bb0188), [Technic Ball Joint](https://www.bricklink.com/v2/catalog/catalogitem.page?P=32474) (I know you mentioned in your comment), [Technic Ball Steel](https://www.bricklink.com/v2/catalog/catalogitem.page?P=99948), and [two of these halves](https://www.bricklink.com/v2/catalog/catalogitem.page?P=44359) can be connected with a tyre.  
  > **username_2**: @MatthewJensen oops, I forgot about the Magnet Ball (which I think I have from some portion of that Harold Potter set) and the Ball Turret half. But those Steel Ball pieces were a surprise! I wonder how many GBC components one of **those** would destroy.  
  > **username_3**: The magnet ball could be interesting for GBC's, being weighted to one side to potentially make some cool kinetic effects. One could maybe design a 'stronger' GBC layout for the steel guys!  
  > **username_2**: I wonder if I should include the Jurassic World Gyrosphere <https://www.bricklink.com/v2/catalog/catalogitem.page?P=20455>  
  
  ---
  
  ### Answer by username_4 on 2022-06-06. Score: 0
  
  Also Lego set 7029 has a plastic "boulder" that could be an option.
  
  > **Comments:**
  > **username_2**: I looked at the inventory on BrickLink.com, and the only sphere is the Zamor sphere that Sander De Dycker already mentioned. There's the Technic "ball", but it's rather non-spherical, so I didn't include it in my answer either. Or are you thinking of some other piece?  
  
  ---
  
  