This is a quick design that prevents kinks in filament as it's pulled by the extruder. It attaches via the sheet metal screw on the top of the printer's z-axis tower.I printed it at 3 shells 20% infill- just enough to make sure that the part underneath the screw is solid. Let me know if you have any problems! One more tip: it really helps if you can get the support to go at a 45-degree angle "into" the groove. This is really important to adequately support the print above. The gcode I posted does this.