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This is a slider knob cap for an Akai MPC3000 or MPC60 sampler. It is as close to the original slider cap as you can get in terms of design, however color might be a bit off depending on what color you choose to purchase.
I've currently test printed the part on an Objet series printer, which is the same technology as the "professional plastic" series. I finally had the chance to get shapeways to print my part, I'm pleased to report that the "professional plastic" series is a perfect fit. However, the normal plastics are a bit tight.
If you would like this part printed in a specific material that I have not enabled, please shoot me a message and I'll open that material.