Why is 3d printer filament so expensive?

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Tags

1. #rapid
2. #properties
3. #expansion
4. #printers
5. #plastic
6. #depending
7. #quality
8. #nozzle
9. #through
10. #price
11. #different
12. #commonly
13. #expensive
14. #their
15. #pushing
16. #caused
17. #filaments
18. #heated
19. #range
20. #moisture