<p>I have a Wanhao Duplicator i3.</p>

<p>I have done many excellent prints with this printer, and have first hand experience that it can do a pretty much flawless print.</p>

<p>But... Recently, I am experiencing weird results. My "flow" seems uneven. When laying down the first layer of the raft, I can see it looks like it "beads" in some places. Thin lines with little "beads" here and there (which seem to be in a constant pattern) i.e. -------()-----()-----()------()------ etc.</p>

<p>I initially thought, wet filament... But drying the filament had no noticeable effect. Further more, all my prints seem to be horribly laminated at a certain "height" of the print. This is really strange as it will print perfectly and only at a certain height, mess up about 5mm of layers (height wise), and then print great again. This seems to be a constant now.</p>

<p>I dont understand how/why this could happen, as the whole z-axis is on a linear spiral shaft. Unless there is a gcode issue somewhere that I am not aware off. I am using CURA as my slicer and I feel that even if there was an isnturuction hidden somewhere at a certain height, it would possibly effect a single layer, and not 5mm worth of layers.</p>

<p>Any ideas?</p>

<p>I have tried:</p>

<p>Different filament
Pushing flow % to 105 and 110% respectively
Cleaned extruder gears and print head
Oiled z-axis shafts</p>

<p>What baffles me, is the weird delamination (or rather lack of lamination) at a certain height. I have not measured this height exactly, but from guestimating, it looks like roughly the same height on every print where the issue is visible (about 3/4 up in the attached image). My support structures are also VERY messy, whilst they were very precise and perfect previously.</p>

<p><a href="https://i.stack.imgur.com/epy7e.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/epy7e.jpg" alt="enter image description here"></a></p>

<p>Thanks</p>

[{'answer_id': 3643, 'author': 'Gunslinger', 'author_id': 5395, 'author_profile': 'https://3dprinting.stackexchange.com/users/5395', 'pm_score': 2, 'selected': False, 'text': '<p>Write a few pieces of gcode to do this. Place it on an SD-card (I assume you have a reader) and select the file you want to execute.</p>\n\n<p>Home all:</p>\n\n<pre><code>G28\nG1 Z0\n</code></pre>\n\n<p>Do you really want to home it directly? I would say you want to take it down slowly and adjusting end-stops incrementally.</p>\n\n<p>First:</p>\n\n<pre><code>G28\nG1 Z10\n</code></pre>\n\n<p>Then</p>\n\n<pre><code>G28\nG1 Z3\n</code></pre>\n\n<p>Then</p>\n\n<pre><code>G28\nG1 Z1\n</code></pre>\n\n<p>etc etc</p>\n\n<p>You can also move it around in the X and Y plane:</p>\n\n<pre><code>G28\nG1 Z5 X50 Y30\n</code></pre>\n'}, {'answer_id': 3695, 'author': 'Eagl3', 'author_id': 6330, 'author_profile': 'https://3dprinting.stackexchange.com/users/6330', 'pm_score': 1, 'selected': False, 'text': '<p>The way I manually level my bed is by connecting a computer to the printer via USB. As far as I am aware, if you have a touchscreen this should be available on the printer options as well for marlin.</p>\n\n<p>But if you connect a computer, simply run something like pronterface or any other manual control gui and:</p>\n\n<p>1) home axes</p>\n\n<p>2) disable motors</p>\n\n<p>3) move printhead in x/y directions as necessary by hand</p>\n\n<p>4) adjust z height manually with the GUI software. This should not affect your x/y positions or turn on their motors.</p>\n'}]
['https://3dprinting.stackexchange.com/questions/3659', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/6209/']