Why is 3d printing filament so expensive?

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Tags

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