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Are there going to be small cups or deep cups or any cups?
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Yeah, the image of the base after fixing the perimeter was lacking the cups.

They're 1/16th" deep and I will be making them with a modified milling bit so that the bottom edges will be rounded and a cone will be left in the center.
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-edit- hold on, stainless steel insert? have you ever machined stainles sst?
just go with brass or even plastic. why press fit?
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I will probably need to epoxy the capillary tubes in place. The material of the disc itself isn't terribly important but I need something that's rigid enough at 1/16th" thickness and I will have to drill 52 holes into it using a programmable mill.
Brass would be fine, I would prefer Delrin though. What would respond best to epoxy with stainless steel?