Hi,
I have a problem with prints of small tubular structures. The tubes dimensions are between 0.4 to 2 mm in diameter.
They are oriented vertically on the buildplate. Laying the structure in horizontally is not an option. Below a diameter of 2 mm the tubes are clogged. You can see that the printer is printing circles where the outer diameter should be, but the filament fills the inside of the tube. Due to this problem, there is too much filament at these points. You can see this problem in the first picture . The tubes have the following diameters from left to right:
0,4mm 0,6mm 0,8mm 1,0mm 1,5mm and 2,0mm
The used settings are:
Layer Height : 0,075mm
Shell thickness: 0,8mm
Retraction: enabled
Fill density: 100%
Print Speed: 50mm/s
FanSpeed: above 0,5mm 100%
Material: ABS
Nozzle: Ultimaker 2; 0,4mm
Material flow: 107% (same problem with 100%)
Printhead temperature: 260°C
Bed temperature: 90°C
Is this a problem with the print settings, or is the slicing process the problem? The problem with the filament getting pushed into the circle and closing it only comes up with small diameters. There is also a problem with every print that the dimensions of the CAD model and the final print do not match.
I attached a picture of the sliced structure in Cura. You can see Cura showing the circles with small squares. These squares are overlapping to the inner side of the circle. The smaller the circle, the more they overlap.
Does anyone have an improvement, comment, or idea, how we can optimize this print?
Bests,
MGG
Picture 1:
https://dl.dropbox.com/s/b5ksiq1lk8kvfeq/WP_20140530_001.jpg
Picture 2:
https://dl.dropbox.com/s/apkbxh84rb1usbt/Slicer.PNG