Prusa Original Prusa i3 MK3, Handbook

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● Nozzle
​ ​
temperature:
​ ​ ​
215 ​ ​ °C
● Bed
​ ​
temperature:
​ ​ ​
50 ​ ​ - ​ ​ 60 ​ ​ °C
● Heatbed:
​ ​​
Make ​ ​ sure ​ ​ the ​ ​ surface ​ ​ is ​ ​ clean, ​ ​ as ​ ​ described ​ ​ in ​ ​​ 6.3.2 ​ ​ PEI ​ ​ print ​ ​ surface
preparation
​ ​ ​
chapter
11.3
​ ​ ​ ​
PET/PETG
PETG
​ ​
is
​ ​
a
​ ​
very
​ ​
tough
​ ​
material
​ ​
with
​ ​
good
​ ​
thermal
​ ​
resistance.
​ ​
It’s
​ ​
universal
​ ​
but
​ ​
suitable
especially ​ ​ for ​ ​ mechanical ​ ​ parts ​ ​ and ​ ​ both ​ ​ indoor ​ ​ and ​ ​ outdoor ​ ​ use. ​ ​ PETG ​ ​ has ​ ​ almost ​ ​​ no
warping
​
, ​ ​ so ​ ​ printing ​ ​ large ​ ​ objects ​ ​ isn’t ​ ​ a ​ ​ problem. ​ ​ We ​ ​ use ​ ​ PETG ​ ​ to ​ ​ print ​ ​ parts ​ ​ for ​ ​ our
printers!
PETG
​ ​ is ​ ​ one ​ ​ of ​ ​ our ​ ​ favorite ​ ​ materials ​ ​ for ​ ​ 3D ​ ​ printing. ​ ​ It’s ​ ​ almost ​ ​ as ​ ​ easy ​ ​ to ​ ​ print ​ ​ as ​ ​ PLA, ​ ​ but
it ​ ​ can ​ ​ offer ​ ​ many ​ ​ mechanical ​ ​ properties ​ ​ that ​ ​ PLA ​ ​ prints ​ ​ just ​ ​ cannot ​ ​ achieve.
The ​ ​ G ​ ​ in ​ ​ the ​ ​ acronym ​ ​ PETG ​ ​ stands ​ ​ for ​ ​ Glycol ​ ​ which ​ ​ is ​ ​ added ​ ​ during ​ ​ the ​ ​ manufacturing
process. ​ ​ Glycol ​ ​ modifies ​ ​ the ​ ​ properties ​ ​ of ​ ​ PET, ​ ​ so ​ ​ that ​ ​ it’s ​ ​​ easier
​ ​
to
​ ​
print,
​ ​
less
​ ​
brittle
​ ​
and
clearer
​
​ ​ when ​ ​ printing ​ ​ with ​ ​ semi-transparent ​ ​ variants. ​ ​ PETG ​ ​ has ​ ​ low ​ ​ thermal ​ ​ expansion, ​ ​ so
even ​ ​ when ​ ​ printing ​ ​ big ​ ​ objects, ​ ​ and ​ ​ without ​ ​ an ​ ​ enclosure, ​ ​ it ​ ​ rarely ​ ​ lifts ​ ​ from ​ ​ the ​ ​ bed ​ ​ and
warps. ​ ​ In ​ ​ addition ​ ​ to ​ ​ that, ​ ​ PETG ​ ​ is ​ ​​ ductile
​
. ​ ​ It ​ ​ has ​ ​ a ​ ​ healthy ​ ​ amount ​ ​ of ​ ​ flex ​ ​ which ​ ​ can ​ ​ prevent
parts ​ ​ from ​ ​ breaking ​ ​ under ​ ​ stress.
Unlike
​ ​ PLA ​ ​ or ​ ​ ABS, ​ ​ PETG ​ ​ tends ​ ​ to ​ ​ ooze ​ ​ a ​ ​ bit ​ ​ and ​ ​ may ​ ​ leave ​ ​​ strings
​ ​
of
​ ​
plastic
​
​ ​ on ​ ​ your
print.
​ ​
You
​ ​
can
​ ​
fight
​ ​
this
​ ​
with
​ ​
increasing
​ ​
retraction
​ ​
and
​ ​
playing
​ ​
with
​ ​
hotend
​ ​
temperature,
​ ​
but
​ ​
if
you ​ ​ use ​ ​ our ​ ​ filament ​ ​ presets ​ ​ in ​ ​​ Slic3r
​ ​
or
​ ​
Prusa
​ ​
Control
​
, ​ ​ we ​ ​ already ​ ​ did ​ ​ that ​ ​ for ​ ​ you ​ ​ and ​ ​ the
amount
​ ​
of
​ ​
stringing
​ ​
is
​ ​
minimal.
​ ​
If
​ ​
you
​ ​
witness
​ ​
a
​ ​
tiny
​ ​
bit
​ ​
of
​ ​
stringing
​ ​
anyway,
​ ​
you
​ ​
can
​ ​
get
​ ​
rid
​ ​
of
it ​ ​ by ​ ​ quickly ​ ​ blasting ​ ​ your ​ ​ finished ​ ​ prints ​ ​ with ​ ​ a ​ ​ heat ​ ​ gun.
PETG
​ ​ sticks ​ ​ very ​ ​ well ​ ​ to ​ ​ PEI, ​ ​ which ​ ​ is ​ ​ generally ​ ​ a ​ ​ good ​ ​ thing. ​ ​ But ​ ​ sometimes ​ ​ it ​ ​ could ​ ​ stick ​ ​ a
little
​ ​
bit
​ ​
too
​ ​
well
​ ​
and
​ ​
you
​ ​
could
​ ​
rip
​ ​
a
​ ​
piece
​ ​
of
​ ​
PEI
​ ​
from
​ ​
the
​ ​
bed,
​ ​
so
​ ​
you
​ ​
should
​ ​
use
​ ​
a
separating
​ ​
agent
​
​ ​ (e.g. ​ ​ gluestick).
If
​ ​ you ​ ​ can ​ ​ handle ​ ​ the ​ ​ oozing ​ ​ and ​ ​ strong ​ ​ adhesion, ​ ​ you’ll ​ ​ be ​ ​ left ​ ​ with ​ ​ a ​ ​ very ​ ​ durable ​ ​ print, ​ ​ that
is
​ ​
considerably
​ ​
temperature
​ ​
resistant
​ ​
and
​ ​
usable
​ ​
for
​ ​
both
​ ​
indoor
​ ​
and
​ ​
outdoor
​ ​
use.
ADVANTAGES DISADVANTAGES
Easy ​ ​ to ​ ​ print Possibility ​ ​ of ​ ​ stringing
Good
​ ​
layer
​ ​
adhesion Not
​ ​
soluble
​ ​
in
​ ​
acetone
Very
​ ​
tough,
​ ​
low
​ ​
warping Prone
​ ​
to
​ ​
scratches
Temperature ​ ​ resistance
Little ​ ​ shrinking
Durable
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