A few weeks ago I got a Mini, which is a delightful step up from my Solidoodle 2 that I’ve been struggling with for years. The prints I’ve gotten from it have all been beautiful, but anything that required some manner of dimensional tolerance has not worked at all. So I finally got around to debugging the problem, and it’s been over-extruding.
I measured out 100mm of filament and extruded it, and it extrudes pretty much 100mm, which is great, except that it’s over-extruding. After running some tests, reducing the flow rate to 60% seems to do what I need it to. It’s not quite there, but I can get a wall/gap test http://www.thingiverse.com/thing:420754 print to at least fit together, which is significantly better than what I had before.
But 60% is a terrible multiplier for flow rate. The filament I’m currently using is Green HIPS from the LulzBot store. I measured the filament 10x, averaged, and adjusted its diameter to 2.93. I did a temp test, and 240 seems to be a perfectly lovely temperature between 220 and 240. Just to be sure, I’m using Cura and the official profiles.
Does anyone have any ideas what’s going on? I can just adjust the flow rate in all my slicer settings, but this seems ridiculous.