Thanks for the responses, if I am reading the it right, the main issue is printing accuracy.
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Originally Posted by Wavytone
The main problem is they are too mechanically weak (they sag under their own weight)
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I'm not sure what you mean here, but there are a few plastic we can print now including nylon and poly-carbonate. What mechanical properties are we specifically looking for?
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Originally Posted by astronobob
Why would you not want to use Glass
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and prob looking at a new method
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Partly, but also cost. Plastic is significantly cheaper than glass, just seeing what materials have been used and if plastics have even been considered.