Wanhao Duplicator i3 Filament spool holder with ball bearings
thingiverse
This product fits several filament rolls with varying inner diameters perfectly. The ball-bearing design ensures that even larger rolls roll smoothly without any hindrance. The holder part, excluding threads, measures 76mm in length and 19mm in diameter. For optimal use, pair this spool holder with the metal bracket provided by Wanhao i3 duplicator. Although it may fit other spool holders as well, ensure you have a larger nut to attach it securely; this larger nut is included with the Wanhao i3. To complete the assembly, add 10 metal balls measuring 4mm in diameter to form a bearing layer against the outer tube. These metal balls can be sourced inexpensively from online marketplaces like eBay.
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