608RS 8 x 22 x 7 mm Deep Groove Ball Bearing, 10 Pcs 608 2RS, Double Black Rubber Sealed Ball Bearings, Fit for Skateboard Bearings, 3D Printer RepRap Wheel, Roller Skates, Inline Skates (Pack of 10)

These ball bearings, like most low cost ones on amazon, will work for what you are doing if you need them for 3D Print projects. The only issue is they use a "grease" to lube the bearings, but this is common but all but the higher quality bearings.My suggestion is follows and others will have different suggestions, but in the end the result is the same.1st: PREP - Remove them all from the bag and have 2 "good" paper towels ready or 2 shop towels.2nd: REMOVE - Take a small flat head screwdriver or good knife and carefully remove the black rings on the sides. This will expose the bearings.3rd: CLEAN - Use any good cleaner, rubbing alcohol, degreaser, etc. I used "invisible glass" window cleaner, cause it will evaporate when it dries. Spray into the bearings and rub with the towel to clean off the grease. There are other methods like soaking them, but that takes longer, but less effort.4th: Oil - When your done with the last one, grab the 1st one and spin in your fingers to rotate it around. Then transfer over to the other towel. Grab some 3-IN-ONE Oil or 3-IN-ONE Silicone, and drip it into the bearings all the way around. Once you do all of them, flip them over and repeat with oil. The oil will flow through, but this is just to make sure.5th: Finish - Use the towel (clean side) and just wipe off any excess oil off the bearings. Spin them in your finger to make sure oil is in all parts and distributed. You will notice a big difference in spin time and resistance vs when you started.Optional - You can place the black rings back on them if you wish. It depends on your usage. If you are making fidget spinners, then put them back on. I am using them as filament holders, so they are in a enclosed spot and not subject to dirt, grim, or dust. So I leave mine off.You can skip this step if you want to spend $2-$3 a bearing, vs $0.25-$0.50. But if you are working with 10, or 50, or 100 then its cost vs effort and a personal choice. At that point may be easier to just dump them in a jar of cleaner over night, dry, and oil them.

There is some misinformation being spread here. You DO NOT need to fully disassemble each bearing and re-lube them. Each bearing comes sticky and greesy upon handling on their surfaces. This is not normal typically, but might be caused by the packaging and storage conditions of the product itself.All you need to do is get a little bit of rubbing alcohol and clean just the surfaces of the bearings. This will remove any greese hindering the inner bores movement and free up the bearing. The stock greese inside does a fairly good job after this is done, and doing this requires much less maintanance and risk of damaging one by taking them apart.Now that being said, the greese works fine for most applications but if you really wanted to get the most out of it, you should take it apart and relubricate it with a Lithium based lubricant or an equivalent oil. This will provide the most movement and least friction since it is less viscous in general but may require maintanance more often depending on what you use.

These are cheap bearings. As such they are not super smooth. They roll but they definitely have resistance. For my purpose they were perfectly fine. But if you need something that glides I would avoid these.

Nice Quality for very little expense. I bought them to be used in my 3D Printer build on YouTube. I printed tires to put on them so the could roll smoothly on my aluminum extrusions. You can follow along to see how it turns out at PaPawsProjects...

I haven't used them yet but they seem to be a nice quality. There's no roughness in turning and feel "tight" and smooth as they should. Each bearing is in it's own package.

they spin but not free, no grind just heavy on the grease. quality bearing but not for fidget spinners.

I took a chance with this product hoping to replace the bearings I blew out on my climbing machine. Not only did it work perfectly, the climber is more quiet now than when new.

Although these bearings initially worked well, they began grinding within months after installing them on my roll-aboard suitcase. (The previous set of bearings of another brand lasted about six years before wearing out.)They don't last long...

Il reste à savoir leur durés de vie

I bought these to make a fret string bender I thought that the sides may have been tapered but they are flat. The reason for the taper was to create a groove when two are pushed against each other. However no big deal as I can insert a washer between the two to create a small gap to act as a groove.They are the perfects size that I needed and they are greasy to touch. I will not need the grease for my project and will wipe it off .Overall they look well made and am happy with them.

These bearings work and of good quality. I used them for rollers in an outfeed table. They fit snug into a 21mm hole made by 21mm forstner bit. They came in two sealed packages of 10.

You don't want to know how much I used to pay for these high speed rated bearings but it was in the three digits because "apparently" they could only be imported from Germany.They worked perfectly as replacement main bearing for a bench mounted spindle. Cheap and effective. I literally could buy 100 of these for the price I used to pay a single one.

These will not fit snug for the dimensions show.Don’t buy if you want a tight fit.