five iterations of a 3D-printed coin-flipping mechanism ->…
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five iterations of a 3D-printed coin-flipping mechanism -> from cardboard to 60cm across PETG print
v0 was cardboard and a solenoid. v1 was a basic printed housing. By v3 I'd designed an iris-blade mechanism (inspired by camera aperture blades) to recenter the coin after each flip. Originally printed in PLA on an ender3, the larger scale of the final build and rough conditions where it was going to be used (Dubai) made me upgrade to a full PETG print and the larger print bed of the BambuLab H2S. (I tried PA6-GF but that stuff is way too hard to print for flat parts, had a lot of warping and adhesion issues) The iris was the hardest part to get right… tolerances had to be tight enough to guide the coin back but loose enough for the servo to drive reliably over thousands of cycles.
#technology
v0 was cardboard and a solenoid. v1 was a basic printed housing. By v3 I'd designed an iris-blade mechanism (inspired by camera aperture blades) to recenter the coin after each flip. Originally printed in PLA on an ender3, the larger scale of the final build and rough conditions where it was going to be used (Dubai) made me upgrade to a full PETG print and the larger print bed of the BambuLab H2S. (I tried PA6-GF but that stuff is way too hard to print for flat parts, had a lot of warping and adhesion issues) The iris was the hardest part to get right… tolerances had to be tight enough to guide the coin back but loose enough for the servo to drive reliably over thousands of cycles.
#technology
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