Prusa i3 MK2S, User Manual

Page: 33 / 58

7.3.1.1 ​ ​ Hardened ​ ​ steel ​ ​ nozzle
Hardened
​ ​ steel ​ ​ nozzles ​ ​ are ​ ​ a ​ ​ must ​ ​ for ​ ​ highly ​ ​ abrasive ​ ​ materials. ​ ​ Regular ​ ​ brass ​ ​ nozzles ​ ​ will
degrade ​ ​ very ​ ​ quickly ​ ​ and ​ ​ lose ​ ​ their ​ ​ properties.
Most
​ ​
of
​ ​
the
​ ​
abrasive
​ ​
materials
​ ​
are
​ ​
composites,
​ ​
plastics
​ ​
with
​ ​
something
​ ​
mixed
​ ​
in.
​ ​
Some
examples
​ ​
are
​ ​
ColorFabb
​ ​
XT
​ ​
CF20,
​ ​
ColorFabb
​ ​
Bronzefill,
​ ​
ColorFabb
​ ​
Brassfill
​ ​
and
​ ​
some
​ ​
glow
in ​ ​ the ​ ​ dark ​ ​ filaments. ​ ​ Always ​ ​ ask ​ ​ your ​ ​ filament ​ ​ vendor ​ ​ if ​ ​ you ​ ​ are ​ ​ not ​ ​ sure. ​ ​ Slight
disadvantage ​ ​ is ​ ​ that ​ ​ some ​ ​ standard ​ ​ materials ​ ​ like ​ ​ ABS ​ ​ isn't ​ ​ possible ​ ​ to ​ ​ print ​ ​ as ​ ​ fast ​ ​ as ​ ​ with
regular ​ ​ nozzle.
7.3.1.2
​ ​
0.25mm
​ ​
nozzle
To
​ ​ get ​ ​ finer ​ ​ detail ​ ​ on ​ ​ 0.1mm ​ ​ or ​ ​ 0.05mm ​ ​ print ​ ​ settings, ​ ​ you ​ ​ can ​ ​ use ​ ​ 0.25mm ​ ​ nozzle. ​ ​ But ​ ​ use
it
​ ​
for
​ ​
only
​ ​
very
​ ​
small
​ ​
objects,
​ ​
only
​ ​
couple
​ ​
centimeters
​ ​
big.
​ ​
The
​ ​
print
​ ​
time
​ ​
can
​ ​
be
​ ​
considerably
longer
​ ​
compared
​ ​
to
​ ​
0.4mm.
​ ​
Ideal
​ ​
use
​ ​
is
​ ​
jewelery.
8 ​ ​ Advanced ​ ​ calibration
With
​ ​ firmware ​ ​ 3.0.12 ​ ​ new ​ ​ calibration ​ ​ options ​ ​ were ​ ​ added. ​ ​ They ​ ​ are ​ ​ optional ​ ​ or ​ ​ experimental
and
​ ​
are
​ ​
intended
​ ​
for
​ ​
advanced
​ ​
users.
8.1
​ ​
PID
​ ​
tuning
​ ​
for
​ ​
Hotend
​ ​
(Optional)
In ​ ​ case ​ ​ you ​ ​ are ​ ​ experiencing ​ ​ wide ​ ​ swings ​ ​ in ​ ​ temperatures ​ ​ of ​ ​ your ​ ​ nozzle ​ ​ (e.g ​ ​ +/- ​ ​ 5 ​ ​​ C°), ​ ​​ you
shall ​ ​ do ​ ​ PID ​ ​ tuning ​ ​ on ​ ​ your ​ ​ printer. ​ ​​ If
​​
​​ you
​ ​
are
​ ​
experiencing
​ ​
major
​ ​
temperature
​ ​
fluctuations
higher ​ ​ than ​ ​ that, ​ ​ check ​ ​ that ​ ​ your ​ ​ hotend ​ ​ thermistor ​ ​ is ​ ​ properly ​ ​ seated ​ ​ in ​ ​ the ​ ​ heater ​ ​ block ​ ​ and
plugged ​ ​ to ​ ​ your ​ ​ miniRAMBO ​ ​ board ​ ​ first.
You
​ ​
can
​ ​
find
​ ​
this
​ ​
feature
​ ​
in
​ ​​
Calibration
​ ​
-
​ ​
PID
​ ​
calibration
​
.
​ ​
In
​ ​
this
​ ​
menu
​ ​
you
​ ​
have
​ ​
the
​ ​
option
to
​ ​
choose
​ ​
the
​ ​
temperature
​ ​
for
​ ​
which
​ ​
PID
​ ​
will
​ ​
be
​ ​
run.
​ ​
Set
​ ​
the
​ ​
temperature
​ ​
with
​ ​
which
​ ​
you
print ​ ​ the ​ ​ most ​ ​ as ​ ​ it ​ ​ will ​ ​ tune ​ ​ it ​ ​ for ​ ​ that ​ ​ the ​ ​ best, ​ ​ however, ​ ​ general ​ ​ stability ​ ​ will ​ ​ improve ​ ​ for ​ ​ all
temperatures ​ ​ (PLA/ABS/PETG). ​ ​ After ​ ​ that, ​ ​ nozzle ​ ​ will ​ ​ heat ​ ​ up ​ ​ to ​ ​ the ​ ​ set ​ ​ temperature ​ ​ in ​ ​ 5
cycles. ​ ​ During ​ ​ cycles ​ ​ it ​ ​ is ​ ​ mastering ​ ​ the ​ ​ amount ​ ​ of ​ ​ power ​ ​ needed ​ ​ to ​ ​ reach ​ ​ the ​ ​ temperature
and ​ ​ maintain ​ ​ it.
Do ​ ​ not ​ ​ touch ​ ​ the ​ ​ nozzle ​ ​ during ​ ​ this ​ ​ process ​ ​ until ​ ​ it ​ ​ is ​ ​ fully ​ ​ finished ​ ​ as ​ ​ it ​ ​ will ​ ​ reach
high
​ ​
temperatures!
Be
​ ​ aware ​ ​ that ​ ​ PID ​ ​ tuning ​ ​ is ​ ​ not ​ ​ a ​ ​ solution ​ ​ for ​ ​ all ​ ​ of ​ ​ the ​ ​ temperature ​ ​ fluctuation ​ ​ issues.
Always ​ ​ make ​ ​ sure ​ ​ that ​ ​ your ​ ​ printer ​ ​ is ​ ​ located ​ ​ in ​ ​ a ​ ​ room ​ ​ with ​ ​ stable ​ ​ ambient ​ ​ temperatures,
more ​ ​ about ​ ​ that ​ ​ in ​ ​​ Thermal ​ ​ Runaway ​ ​ and ​ ​ Temperature ​ ​ Drops ​ ​​ at ​ ​​ help.prusa3d.com
​
.
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