Holes with NO Support

thingiverse

I have successfully developed a method to print intricate designs with holes without needing support material. The key is strategically placing Blu-Tack in the holes just before they would cause stringing. As the print progresses, gently squeeze the Blu-Tack to tighten its fit. While this technique may be challenging at first, those who are skilled can edit the G-code file for a momentary pause in printing to avoid touching the hot extruder head. Even if you miss the spot, the extruder will simply push the Blu-Tack aside, so there's no need to worry too much about perfection.