A transparent plastic dome with a Dremel mounted to it in a 3D printed jig.
https://files.mastodon.social/media_attachments/files/113/172/565/019/554/470/original/479451d967df8452.jpeg
There’s a fair bit of planning involved in finding the true centre and height of these domes. When I come to make the cut it feels like cleaving the Cullinan diamond.
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