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spiruline

how to improve this?

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For the top I would slow it down a bit, using the plugin to change speed/temp at height. http://forum.ultimaker.com/viewtopic.php?f=8&t=2348&start=15

For retraction parameters, there can be a bit of playing around that you will want to do. You want it to essentially release pressure by pulling the filament back, however, the amount of pull and speed are things that can be a bit individualized to the part and printer. Things to consider: how hot are you running? How fast are you printing? How well is your extruder working (is it the upgraded version or the older pressure plate)? How much material are you pushing out beforehand. The hotter/faster you are running the more pressure you are going to have to relieve, which means more travel. The more you travel though, the longer it takes to do this retraction, which allows the print head to sit there idly (heating corners/creating blobs). So, I guess my quick answer for you would be if you feel confident in your machine, try bumping the speed of retraction up a bit and see if that helps. I've seen retraction amounts up to 5mm as well that have worked based up speed and temp. So if that doesn't solve it, maybe bump it up to 3-4 mm on the amount and speed up to 50 mm/s. You may try searching thingiverse for the pyramid calibration test as well as it will burn through less filament as you try your settings than your current part.

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