Here are some metal spools: [www.tridprinting.com]
These seem to be of a diameter that is common for delta printers that use Spectra line, which is 18mm. In fact, they're pretty much an exact replacement for the printed ones RichRap designed for his 3DR printer.
These seem to be of a diameter that is common for delta printers that use Spectra line, which is 18mm. In fact, they're pretty much an exact replacement for the printed ones RichRap designed for his 3DR printer.