Z axis leadscrew support Mod


#1

This something that has bugged me for a while and although I think it will help I’m after feedback and thoughts on this idea.

As some have read and tried Marty’s new upgrade part replacing the springy coupler with a printed one. Since then a few of have gone to full aluminium coupler with the same result as the printed but with a better or more positive mechanical grip on the shaft. I personally had the printed couplers slip.

Now although this works reasonably well I think as higher speed printing I am getting vibrations transmitted into the print.

So to go full circle again I am thinking of re using those springy couplers but in the way they are supposed to be used.

Here is my first attempt of a solution.

So my thoughts are the bearing takes the load of the X carriage and the springy coupler drives the Z axis and my hope some of the vibration and acceleration and deceleration in Z at high speed print is partially absorbed.

I would just run the leadscrew through the bearing and into the coupler to eliminate another chance of issue but at the moment I am just using a printed adapter. I am going to make a aluminum one as well to test, so people could upgrade without buying new leadscrews.

Any thoughts, ideas, anything I have missed?


#2

Printing your z axis alignment too now was looking for something like that


#3

Let me know if it needs to be better in any way or maybe wider for a better hold.


#4

Will do as soon as I get home from work


#5

Ok checked them out they align nicely i cant see any wobble on the lead screws im doing a test print now


#6

@anth0ny any chance you can post the stls somewhere? I have the pillow block bearings - and keen to trial this as a solution.

I am having big problems with the lead screws not behaving in the springy couplers, my z-probe repeatability is shite, and I am sure it is causing random z shifts while printing. I am guessing the extra size and weight of things on a big build is seeing this problem a bit more exacerbated.

Good news - I should have enough length in my rods to use them without the adapter.


#7

@Squid Bam and it’s done… lol


#8

@Squid might be another option

I looked at adapting this to a Wilson at one stage.

I even drew up a version that had the Z motor under the Yaxis/Bed and driving left and right to each side… too many ideas and not enough hours.


#9

I was thinking about that, maybe just disconnect one motor, and run a pulley across the top. Would probably need a tensioner too?


#10

Thanks, you’re a champ! Hopefully get it going over the weekend, and I’ll post results.


#11

actually yeah that might work. Use something like the bearing support from my mod at the bottom… there is already a bearing holder in the top plate… maybe a color and a washer for thrust and do like a spring loaded set of lever and pulley like a bike chain tensioner off the 2020 top bar.

quick and dirty but might just work.


#12

Or what about something like this:

Could use that exact motor mount, or replace the motor with an adjustable idler?


#13

did you guys see this design?
http://3dwrx.com/TrueUp/DIY/


#14

Good find.

Personally I would forget about the Z axis nylon bush idea and just use the Extruder carriage wheel setup for each Z axis and you have a winner.