Evaluate - Test
The first 4 models failed completely. The first failed to create a perfect seal between the outer and inner tubes, allowing seeds to escape the containment chamber. The second solved this problem, but the fit was so tight that the bladda could not fit between the inner and outer tubes. The third model had no proper attachment method and fell off the jembe immediately. With a proper attachment method, the fourth snapped off the jembe because it was too weak, and the infill densities were too light.
Evaluate - Improve
Gradual improvements over the first four designs were as follows:
Switching from PVC to 3D Printed plastic to allow for correct tolerances.
Switching the bladda tension from through-tube to behind-tube.
Changing attachment from bladda tie to screw in
Adding rails to the inner and outer tubes to align them to the holes
Afterwards, the following improvements were made to take Model 4 to Model 6:
Increasing the infill density to 100% to increase strength
Changing the front part of the attachment to prevent mud from getting in
Increasing the length of the attachment to add a third screw for stability.
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