zero_zero
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Finally tracked down a plastics reseller who stocks the very same material which the "dental" pucks are made of...i.e. high purity PEEK. Bought some 1.75 inch dia rod stock to give it a try... gave it to my machine-shop buddy to turn it into some lava sized blocks. Now I owe him a case o' beer, still way way cheaper than anything I saw out there. Standard sized disks to follow...