Ender 3 Pro Z-Rod Stabilizer
thingiverse
Top mounted Z-stabilizer for a standard 608 bearing (buy the cheapest you can find or print one) This might be a very tight fit. If you want to insert the bearing without tools you might want to use a slightly negative horizontal expansion for this. Use supports for the bolt holes. If you use an enclosure, be warned that this thing will make your printer a little bit higher.
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