July 16, 2016 | ProgressTH We've had some trouble printing our needle disposal system caps because of threading on the inside and the inability to use supports. There was a heavy stringing-effect rendering the threads nearly useless and unsightly.
[image above: Result of faster/hotter print settings are seen on the left, while the slower and cooler settings can be seen on the right. Stringing was already removed post-print at this point on the left cap, but the threading is still poorly formed. No post-print processing was required for the cap on the right.]Cura 15.04.2 settings were set at 0.3mm resolution and high speeds at 200 degrees C. So we lowered the temperature to 180, and reduced the print speed from 65 to 50 mm/s and other speed settings to: bottom layer speed 30, infill speed 65, top/bottom speed 30, outer shell speed 60, and inner shell speed 65 (all speeds are in mm/s).
This produced a major improvement leaving almost no stringing-effect and much less time required to clean up the print after it finished.
Hospitals and even our agriculture projects seem to need a lot of threaded components so figuring out how to make this work might help significantly improve the quality and capabilities of our 3D printing.