I’ve got my printrbot quite sometime now - a Jr v2
As a good printer behooves - I’ve modified my far share on my printer.
Only, one thing I don’t seem able to fix; a wave pattern in my prints due to an irregularly in the z-axis which has become worse with time.
from flat to irregularitiesSince I got my printer I’ve noticed that the y-axis was not entirely leveled. I fixed this as good as possible but never seem to get rid of it. It wasn’t that much of a problem since I compromised it with the bed leveling.
_x-axis not level by 2mm_I’m not entirely sure if that something has to do with it. It could though - as you can see on the image below. The Jr moves it’s extruder on a cantilevered platform connected to the z-axis. On the first image you can clearly see the wobbling pattern. To print this side of the object the y-axis has to be extended more than the other side; the image blow that. Here you can clearly see a decrease in the wobbling pattern. When the y-axis is extended, the weight of the extruder could become more of an issue because it amplifies any minor irregularities of the z-axis or minor movements. (Right?)
a lot of irregularities
That is my theory at least, but after some research I found this interesting article with many more causes. [www.evernote.com/shard/s211/sh/701c36c4-ddd5-4669-a482-953d8924c71d/1ef992988295487c98c268dcdd2d687e]
- ‘misalignment of layers in a repeating pattern with a period equal to the Z thread pitch’. English is not my mother tongue so I have some troubles understanding the technically. heheh Does that mean that the rod isn’t aligned exactly with the stepper motor axis?
I’m doubting if this is my case since I’ve two smooth rods guiding the x axis. However, that didn’t prevent the x-axis to be not level…
- Z ribbing, ‘“rounding error in the number of steps per layer causing some layers to be shorter or taller than others”. It has to do with the stepps of the motor and the type of threaded rod. - not my case I think. But to be fair, does anyone exactly know what kind of threaded rod (the pitch) with the Jr v2 is used? I know it isn’t your normal M8
- Constraining by wires etc, they create a resistance by with the axis can more probably. - No.
- Spool pulling against the extruder, which will tend to lift it. My spool can move freely, but it can’t hurt to make a better one.
Extra tip: run the filament through a low-friction tube - this can make quite some difference according the article. So I’m going to get one anyway.
- filament diameter is not uniform round causing thin and wide layers. - mine is okay
- A tip I found here on the forums: wobbly table (not the issue in my case). - mine is okay
The main strange thing about mine particular issues is that one side of je object is fine, almost flat - the other side has a strong wave pattern. However, the pattern is regular…
from flat to irregularitiesI guess it’s kind of an experiment to fix this, so I was wondering if you had any experience, ideas or thoughts on this
Every tip is welcome!