This research was conducted to reduce the defect rate caused by nozzle clogging of printing heads used in binder jet 3D printers. The binder jet 3D printing technology may adhere to the printing head nozzle by dispersing powder due to mechanical operation such as transferring the printing head and supplying powder, and may cause nozzle clogging by natural curing at the nozzle end depending on the type of binder used. To solve this problem, this study created a cleaning module exclusively for printing heads to check whether the durability of printing heads is improved through analysis of printing results before and after using the cleaning module. To this end, this research used a thermal bubble jet printing head, and the used powder was studied using gypsum powder.

Abstract
1. 서 론
2. 써멀 버블젯기반의 3D 프린터
    2.1 써멀 버블젯의 개요
    2.2 3D 프린팅 시스템 기구부 구성
    2.3 써멀 버블 젯 헤드 제어
    2.4 써멀 버블 젯 헤드 클리닝 모듈
3. 제작 및 테스트
    3.1 클리닝 모듈 제작
    3.2 클리닝 모듈 구동 테스트
    3.3 클리닝 모듈 프린팅 테스트
4. 결론
5. References

• 황정철(금오공과대학교 산업공학과) | Jung-Chul Hwang (Student, Kumoh National Institute of Technology) Corresponding Author
• 김태성(금오공과대학교 산업공학과) | Tae-Sung Kim (Professor, Kumoh National Institute of Technology)