ABS	Acrylonitrile butadiene styrene
AM	Additive manufacturing
CB	Carbon black
CCVD	Catalytic chemical vapor deposition
CNC	Cationic cellulose nanocrystals
CNT	Carbon nanotube
FEM	Finite Element Method
FFF	Fused Filament Fabrication
FGF	Fused Granulate Fabrication
FT-IR	Fourier-transform infrared spectroscopy
GNP	Graphene nanoplatelet
GO	Graphene oxide
Gr	Graphite
HME	Hot Melt Extrusion
MEX	Material Extrusion
NIR	Near-Infrared
PEEK	Polyetheretherketone
PLA	Poly(lactic acid)
PVDF	Polyvinylidene fluoride
SD	Standard deviation
SEM	Scanning electron microscopy
SSE	Single screw extrusion
TGA	Thermogravimetric analysis
US	Ultrasonic
Symbols
A	Projected contact area	µm2
a	Contact distance	mm
d	Indentation spacing	µm
Er	Reduced elastic modulus	GPa
P	Indentation force	µN
H	Hardness	GPa
h	Indentation depth	nm
hf	Remaining indentation depth	nm
hmax	Maximum indentation depth	nm
I	Current	A
IFT-IR	Intensity	-
mc	Mass change	%
P	Indentation load	µN
Pmax	Peak indentation load	µN
R	Resistance	Ω
S	Contact stiffness	N mm−1
ß	Geometric constant	-
TE	Extrusion temperature	°C
Tr	Actual temperature	°C
U	Voltage	V
w	Wavenumber	cm−1
ρ	Resistivity	Ωcm