Hemi-demi-sphere
Description
1. The parts have no overhangs.
2. The flat 'bottom' is completely concealed after assembly; there are no flat spots on the exterior of the sphere.
3. Exterior is made entirely of 'sidewalls' where the resolution of FDM really shines.
My test samples were built in transparent PVC on a Solido SD300 Pro, but my goal was to design a Makerbot-friendly shape. Based on feedback from friends, I've adjusted the contours so the pieces 'grab' onto each other after assembly.
More pictures and discussion at my SD300 blog entry at mysd300.blogspot.com/2010/05/novel-decompositions-of-sphere.html
Instructions
Note: the parts fit together with their build planes at right angles, so it'll doubtless be affected by any geometric distortions.
You must be logged in to post a comment.
Printing this on the MakerBot with a raft results in each piece being one layer thicker than desired. The linear stripes of the leftover raft bits make base-adjacent pieces mesh together more solidly, and each pair being slightly thicker than designed makes the model stay assembled much more strongly than the minimal friction offered by an ideal print. I have to throw the ball at the wall exceptionally hard to make it break into pieces. I love this model!
Great Idea to take a idea like a Tennis Ball and dissect it like this. :-D
http://tenniscrowd.com/blog/wp...
That is an awesome design, i would like to get my hands on one just to set around the house and make people ask questions!
Sweet and simple, I like.
Suggestion: Try a little manipulation to make each piece "bulge" at each end and thinner in the middle. This would make them clip together and not fall apart.
Sure enough, a lot of interesting tweaks are possible. The 'bulge' can probably by accomplished by rotating the conical cuts off-center slightly. The OpenSCAD source is attached, so feel free to play around with it.
I also built a hollow 2-piece version that can be used as a container; I'll post that one later.
More from VeryWetPaint
More from Puzzles
Thanks for a really neat print, keep it up!
They print really nice and quick, I wanted something to show at my work and downloaded this, printed and had it assembled within 45 min. Printed it at 0,2 mm layers, 3 shells. (4 bottom ones) @ 80mm/s. No cleanup required! Makes for a really nice proof of concept piece. If I were to change anything I might try rotating it 45 degrees on the bed before printing to see if I could get the pesky seam to be inside the ball when it is assembled, it would really add to the finish in my case.