I found this data for them:
You will need to either remove the pulley, or find a compatible belt. But apart from that, those motors are suitable for a 3D printer.
Quote
Length / Width / Height / 42/42/39
dł.ośki 15mm fi 5mm
weight approx 0,35kg
current of 1.2A
voltage 2,64V
0.38 Nm torque
axle gear belt with a diameter of 13,4mm and 10mm wide working area
6 wires output
You will need to either remove the pulley, or find a compatible belt. But apart from that, those motors are suitable for a 3D printer.