WINDY FADHILAH SUSANTI; ANA WATI, S. F.; INDAYANTI SUGATA, T. L. UI/UX Design of the “PrintOn!” Printing Services Marketplace for UMKM Photocopying and Printing Businesses Using the User Centered Design Method. JURNAL TEKNOLOGI DAN OPEN SOURCE, v. 8, n. 2, p. 495 - 505, 1 Dec. 2025.