by ark19, published

Sphere by ark19 Mar 27, 2013

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A sphere made up of 2x Hemispheres and a threaded hollow cylinder. Does not require supports.

Update 8 Aug 2013:
Added Sphere D42.stl and Sphere int H25.stl
This is a bigger version and can be printed separately.
Added ear rafts to prevent lifting.


Download and print SphereAssy.stl
I printed it with 10% fill, no support.

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Sphere by ark19 is licensed under the Attribution - Non-Commercial - Share Alike license.

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you are the second post i have finally tracked down that offers a twist lock screw design to make a sphere. it mirrors my own design; but not being able to design it into a print file; you sir have done the hard work for me.

giving it a sample print now and if what i believe to be correct; my problems are solved! five stars!

Hope it works for you :D

Will you please adjust the plans to have a honeycomb outside sphere halfs?! It would much appreciated

Sorry just saw your mssg, What do you mean?

done with one half XD jezz this is massive

im making a 6 inch by 6 inch one right now :D

Wow 6 inch! Do share the result :)

Hi. Any chance of separating the parts on this? I live in a cold climate and the screw part keeps lifting :)

ark19 - in reply to Mxdbag

Hi Mxdbag,
try to print:
Sphere D42.stl and Sphere int H25.stl

why not just smudge the first layer

ark19 - in reply to Mxdbag

Hi Mxdbag,
I'll separate them and also add ear rafts.
Will have to do it when I'm back at home later tonight.

this ended up being a torture test for my printer, after countless failures i was able to get a complete print. it kept skipping steps until i lowered my stepper motor current and decreased the acceleration. printed nicely.

because it breaks evey once and a while

make a version with only the screw

try to print:
Sphere D42.stl and Sphere int H25.stl

Ok... whats the secret??? So many thing/kits here on the Thingiverse yet so few get the fit this thing gets. Parts screw together PERFECT! How'd ya do it??? Why can't more be THIS good?

Thanks Andychn!
the secret is to try and try again until you get it right :)
That's what Rapid Prototyping is for right?
My first few prototypes did not even fit properly. For designers who want to design male/female threads, model a CAD design of the male and female thread on a small size first and print them out. If it fits, use the design on the actual final design and print it out. Saves time and material. I learnt it the hard way hehe ;)

Unlike others, my print was too tight to fit, it screwed in a little but then binds, a bit of back&forth and it gets 1/2 way in.

Presumably over extruding?

Hi Michael, this was designed to be loose fit and it should be really easy to assemble.
Could you post a photo of your print?

I loaded a couple of photos under 'I Made One'

Hi Michael, hard to tell from the pics.
try printing:

How does it come that nobody ever though of this yet?? :D Great!

Thanks for sharing!
I was trying to work around the overhang, looks like he found the solution using chambers :)

Actually designed this as a little exercise to print a sphere without supports and without the use of adhesive. Cheers! :)

This is a great little design. good stuff!

Thanks :)

Cool stuff, nice

ark19 - in reply to Adolph


ark19 - in reply to ramai

Thanks ;)

ramai - in reply to ark19

I made one today, (posted it) and it turned out awesome. Loved the design, well done.

ark19 - in reply to ramai

Thanks :)