User manual

29 User Manual
Arduino Materia 101
One of the most critical elements in current
3D printers is the superficial treatment of
the printing plate. When you extrude the
filament, the first layer is crushed by the
brass tip on the surface of the plate; If the
contact surface is able to create a good bond
with the molten plastic can continue printing
with solid bases. If cooling the plastic loses
adhesion, it is very likely that the press can
be damaged due to the departure from the
printing plate before the object is completed.
There is no single solution for all types of
printed filament. For this we mainly see
how act the two materials mostly used:
PLA and ABS, to which we may link and
compare the behavior of other materials.
HOW ABS ENTAILS
It is a thermoplastic with characteristics that
can be varied by changing the relationship
between the three main components
(acrylonitrile, Butadiene and styrene) to
obtain a material with more flexibility or
strength, melting point higher or lower and
even other physical parameters such as the
percentage of thermal retraction. With ABS
are manufactured by injection moulding
and several parts of common objects and
also the first RepRap 3D printers are printing
smart engineering parts and ABS gears.
Resists high temperatures before soften and
then losing its mechanical resistance and
dimensional stability, but as defect has a
temperature higher, printing of 230 or more
degrees Celsius and during cooling is reduced
appreciably, leading often to deformation of
the first printed layers and the consequent
detachment from the printing plate. To avoid
this phenomenon, there are two ways to
use so combined. The first way is to have a
plate covered with a material that has strong
adhesion with the ABS, while the second is to
keep the heat (between 60 and 90 degrees)
to allow the printer to build the entire
piece without thermal retraction occurs so
pronounced. A piece kept in shape with these
two steps throughout the press, will be far
more dimensionally conforming to 3D model
of departure. Often, however, it happens that
there is a partial detachment on thin parts
and elongated, with significant coverage.
In these cases, the printing is completed,
but deformed in part to the arching wider
Print plate in the opposite direction
The material which at the moment is
very handy for keeping the ABS attached
to the printing plate is the hairspray: its
water-soluble components allow you to
create a veil that adheres well to glass dish
and at the same time blends and binds
with the ABS, keeping it firmly stuck to
the glass. To print over, if with the blade
of the utility knife or spatula you can’t
remove the piece (a demonstration of
good grip of ABS on lacquer), you can
remove the glass tray from the printer and
put it under water to soften the lacquer
until the piece will come off with ease.
HOW PLA ENTAILS
This material, created by processing the
pulp plant waste rich in cellulose, comes
from many preferred over to ABS, although
most subject to high temperatures (over 60°
tends to become slack). Printing between
195 and 230 degrees, depending on the
additives that have been added to color
it and modify its physical and mechanical
properties. In relation to ABS is more
environmentally friendly and does not
emit almost no smell when printing. Even
the surface of the pieces printed with the
PLA is more brilliant and Iucida in terms of
retirement we have a variation much less
accentuated thanks to the lower extrusion
temperature. Unfortunately, the range of
temperatures in which the PLA remains
elastic is wide: so if the piece in print is
not properly cooled, threatens to buckle
under its own weight or being dragged
from the extruder more subtle points.
For optimal adhesion of PLA, lacchiamo
to the glass with the lacquer printer in
the box provided, and launch printing.
For items with a significant basis you
should use the preheated plate at 50°.
HOW OTHER MATERIALS
ENTAIL
The behavior of other materials
is due to the PLA and ABS.
Let’s see how in the table on
the following page.