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Wobbless X Mounts for MakerGear Prusa

by odudex, published

Wobbless X Mounts for MakerGear Prusa by odudex Oct 24, 2012

Description

latest version:
thingiverse.com/thing:84640

Tired of trying to align Z threaded rods and get rid of wobble I created X mounts that absorbs XY movements that Z threaded rods cause when not perfectly aligned. The absorbing structures use same principle of some lunar rover wheels. The structure uses ABS flexibility as absorber.
youtu.be/XAVHZ00X4DM

Recent Comments

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I had tried using the springs before on my mendel, and they kept binding to the threaded rods, if they had some sort of sheath it would probably be fine though, or if the spring wire is thick enough.

You can try that, but I recommend to use the 2 nuts per rod with spring between system. About spring, I can assure you there is no sign of fatigue(white spots) on my springs. I printed them with a 0.35mm nozzle, and with this thickness the spring printed with 2 layer wall. For a bigger nozzle I would thicken proportionally. But thickening will reduce flexibility. You can also play different spring lengths and check the results.

I think im going to embed a nut in the piece, and then tap the rest of the plastic, so i get less backlash, also im going to thicken the springs for durability.

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Instructions

On Z threaded rods, to limit vertical movement of nuts it's necessary to glue and small lid over upper nut. Inside use the common nut spring nut system.
The part I printed got a little bit fragile, I have to do some improvements but works great!

youtu.be/XAVHZ00X4DM

If you are having difficulties on slicing it try yo rotate the part.

I also have to check out if the "ABS spring" won't break due to fatigue after a lot of prints.

Comments

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DFarms on Mar 26, 2013 said:

even if your rods are perfectly aligned, they could still be bent slightly. by using the springs in the way they are printed, they let the smooth rods make the axis move in only one direction, by only accepting one axis of motion from the leadscrews. i plan to use a design similar to this in my printer.

odudex on Mar 26, 2013 said:

Nice DFarms. I've been using it for months, it is still working well.
If you are going to re-design it, an important improvement would be place the nuts "tap" in the lower part and re-enforce corners.

thantik on Oct 26, 2012 said:

The problem you're trying to solve is because you're over-binding your threaded rods.  Those bearings at the bottom of the machine are BAD BAD BAD.  Take them out, and replace your rod couplers with the good aluminum ones.  This allows the threaded rod to move in the X/Y as opposed to moving your carriage instead.  You _want_ the Z threaded rods to be loose so that the smooth rod can take over.

ax_the_b on Nov 19, 2012 said:

 Actually the bottom bearings are not bad, if you can get straight rod and center the upper coupling - it offloads weight of the X assembly from the stepper bearings, which are not actually suited for the task.

odudex on Oct 27, 2012 said:

Thantik thanks  for the tips!I've been convinced to solve the problem on its cause.You are right about bottom bearings, I 'll remove it.
I do have aluminum couplers. In the video I was testing one side with with tubes, and it seems tube did a better job. The aluminum coupler have one issue that is: Screwing over threads, that won't allow a good alignment. 

danielpublic on Oct 25, 2012 said:

That's nice, very nice!

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