SIENOC 1 Spool Acrylic 3D Printer Filament Holder Mount Rack for PLA, ABS, Wood, TPU, Nylon, Flexible Materials Material: Acrylic Minimum Spool Diameter: 25.40 millimeter Maximum Spool Width: 102 millimeter Length: 180.3 millimeter Width :121.7 millimeter Height: 162.2 millimeter Remove the protective film Assemble and install the main rack Tighten the screws to fix Put 3D filament and spool spindle 4 x Rack stand 1 x Spool spindle 2 x Set Rack stand to spool spindle attachment knob 8 x Screw