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<p>[QUOTE=&quot;Burton Strauss III, post: 14436578, member: 59677&quot;]There are very few issues, other than desirability. The patents (ACG, SEGS, ICG) are long expired. I&#039;ve never found a patent for ANACS, NGC, or PCGS on the shell.</p><p><br /></p><p>BUT</p><p><br /></p><p>It is expensive to make a mold for plastic injection and for a slab, you need at least three (outer shell top &amp; bottom and insert). Injection molding clear plastic is likely more expensive than opaque.</p><p><br /></p><p>I&#039;ve seen costs quoted at 25K for a simple plastic shell for a product. </p><p><br /></p><p>This page (<a href="https://formlabs.com/blog/injection-molding-cost/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://formlabs.com/blog/injection-molding-cost/" rel="nofollow">https://formlabs.com/blog/injection-molding-cost/</a>) says more like 3k each for low-volume molds. That same page gives per-item costs of $3 - or $8-10 per shell and you probably need a custom &quot;horn&quot; for the sonic sealer.[/QUOTE]</p><p><br /></p>

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