<p>I'm printing part for a chess board from a set on Thingiverse, expanded a little to 50&nbsp;mm square.
After the 3<sup>rd</sup> layer, I'm seeing what looks like raised ripples, and you can feel them with a finger too.  I didn't see this when printing just 4 pieces earlier.
PLA at ~200&nbsp;&deg;C, bed is PEX/flex steel/magnet/AL.</p>

<p><a href="https://i.stack.imgur.com/TK9ZG.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TK9ZG.jpg" alt="enter image description here"></a></p>

<p>The initial layer also had some streakiness (?) after the 1<sup>st</sup> layer.</p>

<p>Odd, as the bed tests out as pretty level using the paper under the nozzle test.</p>

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

<hr>

<p>Looking much better now that the infill is starting.  Will have to look into calibrating the extruder when this print finishes. Printed a 6 hour iPhone stand yesterday, turned out really nice.</p>

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

<hr>

<p>Top layer is nearing done (looks like top layer is finishing, then the lip to go for the edge of the board) and all signs of the rippling are gone.
Will check the 'level' again before we start on the light color squares.</p>

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

[{'answer_id': 10440, 'author': 'Mick', 'author_id': 3953, 'author_profile': 'https://3dprinting.stackexchange.com/users/3953', 'pm_score': 2, 'selected': False, 'text': '<p>It looks like over-extrusion. When layers are printed with 100% infill, excess material has nowhere to go and these characteristic ripples form.</p>\n\n<p>Always calibrate your extruder. 3D Hubs have a good article on the topic:</p>\n\n<p><a href="https://www.3dhubs.com/talk/t/howto-calibrate-tune-and-fine-tune-your-printer-and-filament/5695" rel="nofollow noreferrer">How To Calibrate, Tune and Fine Tune your printer and filament</a></p>\n'}, {'answer_id': 10461, 'author': 'CrossRoads', 'author_id': 16523, 'author_profile': 'https://3dprinting.stackexchange.com/users/16523', 'pm_score': 3, 'selected': True, 'text': '<p>Printing some more parts tonight.  Looks like solution is better bed "leveling" (tramming, or basically squareness between X, Y, and Z axis). Getting it dialed in to the correct height, 1/4 turn of a bed leveling screw at a time.</p>\n\n<p>Also ordered some metal (stainless steel) shims so we can get and check the bed level more accurately than "this index card plus a little bit" as the card measures ~0.16mm and we want 0.18mm to 0.2mm or maybe 0.22mm it seems.</p>\n'}]
['https://3dprinting.stackexchange.com/questions/10439', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/16523/']