Y axis tensioner Elegoo Neptune 4 Plus

My bed was squeaking badly because the original bearings in the tensioner were failing.           I didn't want to wait for an idler from Amazon so I MacGyver'd it (for you youngsters, that means I used what I had). I used two 625ZZ bearings out of a POM wheel and two M3 heat inserts as the bearings' center sleeve. Works great - no squeaks! 

Items used:

• 2x 625zz bearings (from POM wheel)
• 4x M3 heated inserts (M3x4mmx5mm)
• 2x M3x20mm or M3x18mm screws (I used 18mm)

Assembly:

1. printed in PETG.
2. install heated inserts into both holes on the outside of the model where the bearings will be held
3. install the rear M3x20 screw for the tensioner from the inside of the model
4. place a heat insert into the center of each bearing, sandwich the bearings together, and slide them into the model
5. install the M3x20 that holds the bearings in place - you may need to back the screw out and thread it back in a few times until all of the heat insert threads align and aren't spreading things apart. When done the bearings and sides of the model should all be sandwiched tightly together but the bearings should be able to spin.