Anet ET4 roll filament guide
thingiverse
I'm still not getting perfect results due to the lateral screw. I tested it with 10 prints and it seems good, but I'm only at 80% infill for the center parts - maybe less for the other parts since I had to force the ball bearing into place. You'll need a ball bearing 608 and a screw for the lateral part, but I'm not sure what model works best.
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