portable 3d printer pen station mod for my spool holder use glue/3d pen to assemble parts add steel wool to the pen holder original model : https://www.thingiverse.com/thing:6247047 3D pen: https://www.geeetech.com/grey-tg21-3d-printing-pen-p-1211.html Battery adapter: https://www.dewalt.com/product/dcb090/12v20v-max-usb-power-source