MakerBot Educators Guidebook 3rd Edition

MAKERBOT EDUCATORS GUIDEBOOK Chapter 4: Curriculum Project Ideas
PAGE 94
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PRINTING AND TESTING OUT
Before sending the gear models to be printed,
consider how the gears will be printed. Sometimes
what looks to fit together well within a modeling
program does not translate as well in the physical
world. Is there enough tolerance between all the
gears? Is there a possibility that the gears will fuse
together when printed?
TIP:
ASSEMBLING
Before printing, identify areas in the design
that might benefit from chamfered edges.
Chamfered edges are edges that are beveled,
usually at a 45 degree angle, and are at lower
risk of warping.
When putting together the 3D-printed gears be
sure that the planetary gears are able to move
around the sun gear without too much friction and
that the fit of the gears aren’t too loose.
TAKE IT FURTHER
Test how well the planetary gear system works
when outfitted with a motor and determine if
further changes need to be made to the design.
Project: Snap-Together Robohand
Project Category
Part of the Lesson
Design Difficulty
LEARNING OBJECTIVES
• Understand the mechanisms behind a robohand
• Recognize the role 3D printing is playing in bringing down the costs
of 3D prosthetics
• Discuss how the existing design could be improved and what
changes would be needed
MAKERBOT EDUCATORS GUIDEBOOK Chapter 4: Curriculum Project Ideas
PAGE 95