Printed Conductor Transmission Line Test Part

thingiverse

Simple transmission line test sample for determining sheet resistance and resistivity of printed conductive patterns. I'm printing it with a dual extrusion hotend, but it would be easy enough to print on a single-extrusion hotend with some gcode tweaks. I'm using protopasta's conductive filament, and with .15 mm layer height I get a sheet resistance of around 800 Ω/sq, and a resistivity of ~12 Ω*cm which is actually a bit better than the 30 Ω*cm they spec it at for x/y resistivity. Pads are separated by 1 cm, trace width is 0.4mm but in reality will depend on your nozzle/extrusion settings (but set line width to .4mm in slicing software to make sure it comes out as a single line). It's also meant to be sliced with a 0.15 mm layer height. Would be interesting to see how parameters such as nozzle temp and extrusion speed effect the resistivity, if anyone wants to give it a shot.