CTC Filament Guide fits directly onto a CTC dual 3D printer fits with NO modifications to the printer, fits around and over existing nuts and bolts, very strong and designed to have 1/8" BSP x 5mm tube straight air/pneumatic fittings screwed into the arms, each of which will require cutting with a tap after printing, print in abs or pla, 0.2mm layer and wall thickness of 4 to allow for cutting threads in finished part. Can be used with 1kg rolls, guides filament off for trouble free unwinding, replaces the main wiring loom clamps, three small cables ties will be needed to complete installation. You will need a friend or nimble fingers to fit the nuts behind the axis drive shaft on the inside of the printer Designed by myself, & fitted to my printer. Happy printing ! Additional, You will need the following to complete this upgrade: Some common sense: 1x BSP 1/8 Thread Cutting Tap. (BSPT taper OR BSP parallel makes no difference here either will do) 3x small cable or zip ties 2x 1/8 male thread x 5mm diameter (outside diameter of pipe) push in air fittings to attach the filament guide tubes to the arms on the model