<s>
PDMS	B-Algorithm
stamps	I-Algorithm
are	O
pieces	O
of	O
polydimethylsiloxane	O
(	O
PDMS	O
)	O
,	O
a	O
silicone	O
,	O
that	O
have	O
been	O
patterned	O
usually	O
against	O
a	O
master	O
mask	O
to	O
form	O
a	O
relief	O
pattern	O
used	O
in	O
soft	B-Algorithm
lithography	I-Algorithm
.	O
</s>
<s>
This	O
PDMS	B-Algorithm
stamp	I-Algorithm
can	O
be	O
used	O
in	O
either	O
its	O
current	O
form	O
as	O
a	O
relief	O
surface	O
for	O
techniques	O
such	O
as	O
microcontact	B-Algorithm
printing	I-Algorithm
or	O
can	O
also	O
be	O
attached	O
to	O
an	O
external	O
source	O
by	O
tubing	O
so	O
that	O
liquid	O
may	O
be	O
passed	O
through	O
channels	O
on	O
its	O
surface	O
.	O
</s>
<s>
In	O
this	O
second	O
case	O
it	O
will	O
often	O
be	O
laminated	O
to	O
a	O
surface	O
so	O
that	O
chemistry	O
can	O
be	O
performed	O
on	O
that	O
surface	O
producing	O
a	O
pattern	O
of	O
the	O
PDMS	B-Algorithm
stamp	I-Algorithm
on	O
to	O
the	O
surface	O
.	O
</s>
<s>
Alternatively	O
a	O
PDMS	B-Algorithm
stamp	I-Algorithm
can	O
be	O
laminated	O
to	O
a	O
second	O
piece	O
of	O
PDMS	O
to	O
form	O
a	O
contained	O
device	O
.	O
</s>
<s>
PDMS	B-Algorithm
stamps	I-Algorithm
can	O
be	O
procured	O
from	O
some	O
commercial	O
sources	O
such	O
as	O
Research	O
Micro	O
Stamps	O
.	O
</s>
<s>
The	O
main	O
drawback	O
of	O
microcontact	B-Algorithm
printing	I-Algorithm
for	O
biomedical	O
application	O
is	O
that	O
it	O
is	O
not	O
possible	O
to	O
print	O
different	O
molecules	O
with	O
one	O
stamp	O
.	O
</s>
<s>
Fully	O
automated	O
micro	B-Algorithm
contact	I-Algorithm
printing	I-Algorithm
equipment	O
was	O
developed	O
.	O
</s>
<s>
It	O
consists	O
of	O
the	O
steps	O
of	O
the	O
micro	B-Algorithm
contact	I-Algorithm
printing	I-Algorithm
process	O
:	O
loading	O
,	O
inking	O
,	O
drying	O
,	O
printing	O
,	O
alignment	O
,	O
cleaning	O
,	O
unloading	O
.	O
</s>
