2 days of fighting with vertical waving. Printer Ordbot Hadron, slicer Simplify 3D. The pattern always the same, no matter what.
What I tried:
Increase/ Decrease acceleration
Decrease jerk
Change layer height
Tight/loose belts
Tight/loose Z wheels
Change print speed
Change temperature
Any suggestion will be appreciated
@Mark_Rehorst I just looked - pattern matches exactly the thread pitch. It appears on X and Y axes. The wheels should prevent X axis from wobbling - they limit axis by the rail, not affecting by threaded rod. Anyway i will check.
Check the alignment of the couplers. It doesn’t take much…
That’s some serious z wobble. Take your rods out and roll them on a flat surface. I suspect one is pretty bent. Also, you really don’t need any holders for those at the top of your z as that is known to induce z banding as well
Looks like classic screw wobble, but there’s an exhaustive list of the possible causes here: https://www.evernote.com/l/ANNwHDbE3dVGaaSClT2JJMcdHvmSmIKVSHw
I am changing Z threads.
This looks like the layer height and z axis steps are not synchronised. What is the stepper specs and leadscrew/threaded rod measurements.
@Victor_Serov what layer height are you printing at?
@Nathan_Walkner they look quite big compared to M8 thread…
@Nathan_Walkner then there will definitely be an error at 0.2mm to 0.4mm layer height…
@Jan_de_Jager @Nathan_Walkner It is not an issue, because I changed layer height and pattern stayed the same. I used this calculator (I have 1600 steps/mm) and all my tries had full number of steps - 0.2, 0.25, 0.3.
It is 8mm ACME trapezoidal rods.
Oh ok. Then I might be wrong…
@Keith_Applegarth Can you explain?
Maybe be poor bearing alignment? Just check that your x end idlers can move absolutely freely on the axis.
Are your z nuts rigidly coupled to your z carriages? If so then if your screws aren’t fully straight or properl;y aligned or set in the couplers then this will happen.
You can print anti wobble fittings specifically for the ord bot (plenty on thingiverse) which will also act as a bed crash safety system as the z carriages are no longer constrained to the screws. This is one of the first things ord bot users make (I’ve got them also on my ord bot) because threaded rods are rarely 100% straight.
Follow Chengster N’s recommendations. Your Z screws are overly constrained. Any wobble in the screws distorts the frame. I thought Ord Hadron designs accounted for that years ago, I wonder if the kit seller didn’t update their machine. My Ord has proper isolators.
@Chengster_N Something like this? http://www.thingiverse.com/thing:38534
That one looks worth trying.
Maybe its not mechanical, your using heatedbed??? If your temperature change over time, going up and donw, can create he same effect
