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LM8UU Linear Bush

by Gyrobot May 20, 2013
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Made 4 of these, had to sand the outside slightly and file the inside a little, got them nice and smooth to fit into the mounting block and slide nicely on the rod, only using 3 for my Y axis. Works nice, thanks!

perfect mine fitted straight off the printer no play nice :)

They slide fine on the rods but when you tie them down with zip ties, they get way too stay to move even by hand let alone the steppers.

Hi, the bushes are recommended to be encapsulated in a clamp block like in the photos above.

Do you a link for this clamp block?
Thanks for getting back to me!

how many time you are using it?

Hello gyrobot, i am spanish, sorry for my English , it is a translator.
I tried printing with nozzle 0.4 and 1.75 filament testing with various temperatures in nylon and have been unable to get the detail that you have achieved in the images , as accomplished ?
Lo pongo tambien en español por si conoces mi idioma
he intentado imprimir con nozzle de 0.4 y filamentode 1.75 probando con varias temperaturas en nylon y me ha sido imposible conseguir el detalle que tu has logrado en las imagenes, como lo ha conseguido ?

Me parece PLA a 50um o menos. Tambien el puede tener una apertura menor (0.3m) en el nozzle.

Some one tried this with PETG?

I made LM12UU's with PETG, as well as PLA, for a comparison test.

The sliding is good on both, but the PETG ones are more prone to 'sticking'.

I use DryLin's now, as I have a large-format printer with a heavy bed.

I am designing a delta style printer and would like to use these bearings, but would like to model them in my assembly before printing. Could you provide 3d files such as SLDPRT or OBJ so I can add them into my assembly?

You can convert the stl into a step file for importing by using FreeCAD : https://www.youtube.com/watch?v=avVNfIswkMU

scaling it will also change the outer perimeter ...

You can scale it down and up your flow rate so the outside diameter is still correct. I assure you the CAD is dimensionally correct, but usually this comes out a little tight, I few runs through with threaded bar and all is perfect. YMMV due to different printer calibrations.

Comments deleted.

I see you have an IGUS RMJ.. bearing in the picture , how well does it perform ? because I'm wondering if I should buy a few of them for dust proofing my linear rails?

Hi, I actually think the IGUS bearings are a little loose for my liking. I have the usual set-up of using 3 bearings on two parallel 8mm smooth rods, two on one rod and one on the other. I actually got a little play, sufficient enough to create a bit of a skew when changing direction either X+ to X- or Y+ to Y-. This is noticeable when printing a circle and I got little flats at the extreme x or y of the circumference. This thing can be printed tight and opened out with a drill or threaded rod until the desired fit is achieved. Another option is the following self centring bush of mine : http://www.thingiverse.com/thing:97041http://www.thingiverse.com/thi...

LM8UU & LM10UU Linear Bush - Self Centering
by Gyrobot

Thanks allot , the only problem I have with printed bearings is that they wear a little fast on the X an Y carriages but for the Z they work fine , but how do the IGUS bearings stack up against the actual LM8UU linear bearings?

Definitely quieter but like I said in the above reply, they are a little loose from new, so it's almost like they are pre-worn. I didn't have them on that long before I replaced them back for the ball bearing type, now my circles are back round again.

I could print and sell? with your permission?

Hi yes, you may sell these under the condition that you attribute the design to me. Let me know how it goes.

Cool that tecleob asks, and cool that you allow it :)

eu poderia imprimir e vender? com sua autorização?

Oi, sim, você pode vendê-los sob a condição de que você atribui o projeto para mim. Deixe-me saber como ele vai.

Maybe you could split in two half and make two slits for cable ties, then you don't have to take your printer apart to mount them. :-)

That could work, but be careful not to squeeze the bush out of roundness, which would be easier if it is split.