Molding rubber for a pre-production prototype using a 3D printed model

molding-rubber-for-production-models

When you’re getting close to a production run the prototypes really need to hit the mark before pulling the trigger. [Bob’s] still hard at work getting his scoreboard off the ground and his most recent endeavor was to find a way to prototype the rubber gasket without blowing his shoestring budget. His solution was to harness the power of 3D printing to generate a model from which he could create the mold from which he cast the rubber part.

To make things a bit more difficult, the band isn’t just decorative, it doubles as the tactile part of the scoreboard buttons. You can see all six of them (before being painted to make them stand out) in the inset image above. Just above that image is a picture of the mold making process. The toothpicks are suspending the 3D printed model of the rubber band while the lower half of the silicone mold sets up. Once that had happened [Bob] sprayed release agent to ensure the top half of the mold wouldn’t stick while it cured.

The results turned out just great. Sure, this isn’t the way to go if you’re making a lot of these things. But we’re impressed at the quality he achieve for a one-off item.

If the finished product on the left looks familiar it’s because we looked in on the project last June. [Bob] continues with improvements and plans to launch a crowd funding campaign this week.

Camera adapter for a microscope

camera-adapter-for-stereo-microscope

[Steve] really has a nice microscope setup in his lab now that he built a video camera adapter for his stereo microscope. The image above shows the magnified view of the circuit board on the LCD screen behind it. This lets him work without needing to be in position to look through the eye pieces. The hack is a perfect complement to the custom stand he fabricated for the scope.

The camera attachment can be seen attached to the right lens of the scope. It’s an old security camera which he already had on hand. The stock lens wasn’t going to bring the picture into focus, but he had some different optics on hand and one of them fit the bill perfectly. The rest of the project involves fabricating the adapter ring on his lathe. It slips perfectly over the eyepiece and even allows him a bit of adjustment to get the focal length right. The best view of this is shown off in the video after the break.

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