This is similar to the stock Ender 3 pro/V2 filament holder. Just enlarged and strengthened to be suitable to carry a 3kg spool of filament. Fits the same as the stock holder, The original style looking threaded holder nut thingy might need to be filed a little on the sides to fit.
It all fits and works well on my Ender3 pro and V2.
Ender3_Extended_Filament_Holder.stl | 311.7KB | |
Ender3_Extended_Filament_Holder_ThreadedNut.stl | 155.9KB | |
Ender3_LargeFilamentSpoolHolder_TwistCap.stl | 250.4KB |