41

ok…i’ve checked well your printer building manual, and I think the fast way to fix is by installing new z-screw(s), but first contact the manufacturer and ask them some tips! Also you may try to remove the z-screws, place it on a flat surface and make it roll, observe while rolling, the screw should be always perfectly touching the surface, otherwise it is bend and should be replaced…

42

don’t have to be sorry for your english, mine are not better haha

Thank you, i’ve well understanding, but what i try to say its i have not much space between the end and the extruder axis, like you can see on the picture.

i’ll try something else, but at this point i’m not sure if i do to make a new structure for z axis myself or just add this anti wobble, but it seems not designed to be used for a long time

DSC_2574.jpg
DSC_2574.jpg5147×3940 7.25 MB
DSC_2575.jpg
DSC_2575.jpg3152×3269 4.28 MB

43

I think so, too.

Z axis screws should not be constrained at the end. I have a ReprapPro Huxley and actually the end are free:

https://reprappro.com/wp-content/uploads/2013/10/huxley_kit_big.png

44

Hey !

So today i’ve buy two new M5 screw bar, but i think i do to replace Achse Starre Kupplung too, because they don’t turn right, so i will do this, an when i’ve replaced it, it will be good

There you can see :

45

hi, yap i’ve already removed it, i’ve prined new one without constraint, to just be a simple cap, don’t touch the screwed bar

46

Hi

On my prusa black steel i use a long 2 cms m5 nut to reduce wobble and play. works like a charm …

47

Hallo i am not a Prusa user but it seems to me it could also have something to do with your extrusion. The lines in the smaller part are smaller than the other and don’t fill the whole form… Maybe you have some problems with the turning of your spoel or is your extruder motor wobbling.If you print at a lower speed without the spoel pulling on the filament. And if you push the filament helping the extruder do you get the same results?

48

Hi, you just need to switch bad couplings from Z motors to threaded rod with simple tubes. They work the best. It is definitely wobble, as you can see whole layers are shifted and I bet in 0.8mm pattern if you use 5mm threaded rod.

See my manual Prusa Knowledge Base

3 Likes
49

Carrefull with the couplers, there are two main variations:

1) Like above, the screw will push the rod in such way that, unless it would have the exact same width than the hole (which is impossible of course), it will not be centered.

2) Flexible couplers. These have 2 more screws that will help pinch the rods. The idea is to first screw these as much as possible then use the central screws to hold the rods if necessary. Chances are that things will be much better aligned. I also ofteen use aliminium foil to thiken rods if necessary, that allows for some fine tuning and almost perfect alignement.

here is the one I’m using:

http://www.aliexpress.com/item/10pcs-5-5mm-aluminium-linear-Shaft-Coupler-5mm-with-5mm-D-L-20mm-25mm-clamping-Flexible/1618524049.html