The spoolholder supposedly fits the following models: (I only tested it on my own model though) GL30, GL280, GL301, GL340, GL420, GL423, GL425, GL430, GL4525, GL5028, GL530, GL540, GL544, GL545TP2-3, GL550, GL555TP2-3, GL560, GL570, GL580, GLC120, GLC13, GLC14, GLC1423, GLC1823, GLC1825, GLC1825L, GLC2000, GLC2500, GLC2500L,GLC3000, GLC3630L, GLC3630L20, ST4525, ST5528, ST5530, STC1815, STC1820 You probably need to add support in both sides before printing.