June 30, 2015
Description
I had major problems with the print quality when it comes to infills, or sharp perimeter turns. The infills were printed bumpy, and my nozzle plowed through or rattled over them. Furthermore, the second extruder's nozzle bumped also against the print when it crossed the infills.
The guys at Maker's Tool Works said that I have a flow rate issue most likely, i.e., my flow rate is too high. It has surprised me since I calibrated my extruder as Thomas Sanladerer explained at YouTube (https://www.youtube.com/watch?v=YUPfBJz3I6Y) and got a nearly perfect result.
But after reading the article at
http://ohmeye.com/2013/reprap-extrusion-flow-calibration/
I reduce my flowrate from a value of 105 to 98 (about 7%) for my current filament spool. The results are astonishing. No bumps, no crashes, no plowing.
So I build myself these two calibration cubes that help me to figure out the right flowrate after a filament change. These models don't take long to print, but you have enough infill layers to set your flowrate right. Because my printer has a moving bed, I made the model longer on the Y axis to see the infill when the bed moves towards me.
First I used the 60mm version (Y-axis), but it was a bit to short in my opinion. So I created an 80mm version. You can get both version here.
The models were made with Fusion 360 and should be very accurate. So you can also do some more measuring with them.
Please also take a look at my other designs, printer parts, and tools.
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License:
Creative Commons - Attribution - Non-Commercial
MartinMajewski
