Adrian Bowyer came up with the name
RepRap, and Ed Sells came up with the logo. The teardrop shape is the profile of a cylinder with 45
o angles above. Our commercial FDM machine can make a 45
o overhang without support material, so - if you want a horizontal hole to put a cylinder through - the teardrop profile gets made without support. This is both faster and neater. And for the vast majority of cases it doesn't matter that it is not completely round.
The teardrop is also an important example of the fact that, with this technology, complexity of shape costs nothing.
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