INTRODUCING OUR  HOLIDAY BUSINESS BUNDLE
LEARN MORE

<div id="cookie_notice" class="sw-cookie-notice sw--padding-vert-4 sw--padding-hor-1 sw-dms--box-shadow--big"> <div class="sw-dms--color-white sw-grid-flex sw-grid-flex--wrap-mob sw-grid-flex--wrap--tab"> <div class="sw-cookie-notice__text--mob sw--padding-left-8 sw--font-size-14 sw-grid-flex__cell-5-7 sw-grid-flex__cell-1-1--mob sw-grid-flex__cell-1-1--tab"> We use cookies to offer you a better browsing experience, including personalized advertising. By continuing to use the site you agree to their use. <a href="/legal/privacy-statement" target="_blank">Learn more</a> </div> <div class="sw-grid-flex__cell-2-7 sw-grid-flex__cell-1-1--mob sw-grid-flex__cell-1-1--tab"> <a class="sw-dms-button noty_close sw--padding-hor-7 sw--position-absolute sw--position-right sw--margin-right-13 sw--hide-mobile sw--hide-tablet" data-sw-set-cookie="euCookie">OK</a> <a class="sw-cookie-notice__btn--mob sw-cookie-notice__btn--tab sw-dms-button noty_close sw--padding-hor-7 sw--margin-vert-3 sw--hide-desktop" data-sw-set-cookie="euCookie">OK</a> </div> </div> </div>

<div class="sw--display-block sw-dms--color-white" style="background-color: #1e2740"> <div id="emailModalContentContainer"> <span class="noty_close sw--position-absolute sw--position-right sw--padding-top-3 sw--padding-right-3 icon-cancel sw--opacity-8 sw--z-index-10"></span> <div class="sw-row"> <div class="sw--position-relative sw--display-block sw--padding-3" style="min-width: 380px"> <p class="sw--font-size-16 sw--margin-bottom-2 sw--margin-right-6">Sign up to hear about special promotions</p> <form action="/register/email-signup" class="sw--position-relative" data-confirmation="emailConfirmationModal" data-sw-email-modal-form> <input type="text" class="sw--input-height__medium" style="width:60%;" placeholder="Email address" name="email" /> <input type="hidden" class="" name="location" value="/product/UJ46RQW2U/horned-sphere-fat" /> <input type="hidden" class="" name="confirmation" value="emailConfirmationModal" /> <input type="submit" class="btn-primary sw--margin-left-1" value="Subscribe" /> <div id="emailModalFormError" class="text-error" style="display:none"></div> </form> </div> </div> </div>

Click and drag to rotate
Horned sphere (fat) 3d printed

DIGITAL PREVIEW
Not a Photo

White Natural Versatile Plastic
Horned sphere (fat) 3d printed
Horned sphere (fat) 3d printed

DIGITAL PREVIEW
Not a Photo

Horned sphere (fat)

Made by
$63.30
3D printed in white nylon plastic with a matte finish and slight grainy feel.
QTY
Product Description
The Alexander horned sphere is a topological shape whose interior is equivalent to the inside of a ball, but the outside is not equivalent to the outside of a ball.
For example, you can contract a loop in the outside of a ball, but not in the outside of the horned sphere if the loop goes around the handle. However, with this approximation of the horned sphere, you can contract the loop because it branches only finitely many times. So here is a puzzle game that will test your patience and give you an intuitive understanding why it is impossible to contract the loop in the ideal case: Tie a thread around the big handle and try to free it by maneuvering it through the branches.

If this product is too expensive for you, try the less fat version, also available in my shop.
Details
What's in the box:
Horned sphere (fat)
Dimensions:
13.59 x 10.8 x 3.53 cm
Switch to inches
5.35 x 4.25 x 1.39 inches
Switch to cm
Success Rate:
First To try.
What's this?
Rating:
Mature audiences only.
Sign In or Join to comment.
 
 
Logo

Hello.

We're sorry to inform you that we no longer support this browser and can't confirm that everything will work as expected. For the best Shapeways experience, please use one of the following browsers:

Click anywhere outside this window to continue.