This is a mod of the Ultimaker 2 that moves its extruder on the top of the feeder:<br><br>https://www.youtube.com/watch?v=AafTbwCPI98<br><br>It is intended to try reducing the underextrusion problems (see http://umforum.ultimaker.com/index.php?/topic/3261-ultimaker-2-extrusion-problem/page-2)<br><br>You have two parts to print:<br>- The block.stl, this part binds the extruder on the top of the feeder.<br>- The tube.stl, this part is a guide tube that goes inside the feeder, because the guide tube will now enter in the filament pusher box on the top, and not on the back
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