FFF	fused filament fabrication
PA12-CF	carbon fiber-reinforced polyamide 12
PA12-GF	glass fiber-reinforced polyamide 12
CoF	coefficient of friction
ABS	acrylonitrile butadiene styrene
PC	polycarbonate
PLA	polylactic acid
IL	Ionic liquid
PIL	protic ionic liquid
MSu	bis(2-hydroxyethyl)ammonium succinate
MCi	bis(2-hydroxyethyl)ammonium citrate
SLS	selective laser sintering
PA66	polyamide 66
WTA	wear track area
ws	specific wear rate
SEM	scanning electron microscopy
EDX	energy dispersive X-ray spectroscopy
SD	standard deviation