A way to mount larger spools to the side of the Ender 3. You will also need some 2020 extrusion (the same stuff that the crossbar is made of), some T-nuts and some M4x10mm bolts. I sourced the extrusion and T-nuts from Core Electronics in Australia, links below. And the M4 bolts from my local hardware store. https://core-electronics.com.au/slotted-aluminum-extrusion-20mm-x-20mm-610mm-long.html https://core-electronics.com.au/aluminum-extrusion-slim-t-nut-for-20x20-m4-thread-pack-of-50.html Print settings: PLA No support Brim 0.25mm layer height 3 layer wall 80% line infill (vary the lines to run parallel with the extrusion)