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VFX: Houston, station on space to ground.

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Welcome to "Space to Ground," your weekly
look at what's happening on board the International

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Space Station.

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I'm Amiko Kauderer.

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The space station crew is set to capture a
dragon.

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SpaceX's Falcon 9 rocket with the Dragon resupply
ship atop is set to liftoff from Cape Canaveral,

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Florida on Saturday at 2:14 am eastern.

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The craft is loaded with more than 5,000 pounds
of supplies and science experiments for the

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station.

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Flight Engineers Reid Wiseman and Alexander
Gerst refreshed their robotics skills this

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week in advance of dragon's arrival and capture
on Monday.

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And arriving aboard dragon is a piece of equipment
that may transform the station into a working

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machine shop.

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It's the first ever 3-d printer flown in space.

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The printer works by extruding heated plastic,
which then builds layer upon layer to create

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three-dimensional objects.

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So that critical missing bolt may no longer
require a wait for the next resupply ship

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to be replaced.

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Instead, the part could be manufactured in
space.

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This capability could decrease cost and risk
on the station by creating on-demand supply

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for tools and parts.

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As the three current station residents continue
their work in space, the other half of the

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Expedition 41 crew is preparing to join them.

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NASA astronaut Barry Wilmore and cosmonauts
Alexander Samokutyaev and Elena Serova traveled

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to the Baikonur Cosmodrome in Kazakhstan last
week to complete final preparations for their

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launch to the station on September 25 at 4:25
p.m. eastern aboard their Soyuz spacecraft.

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After a six-hour trek to the orbiting complex
the Soyuz will dock to the station's Poisk

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module, and its three crewmembers will spend
nearly six months living and working in space.

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This week's social media question is:

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How do the docking ports on the ISS prevent
leakage?

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Rubber or plastics would get brittle in space,
right?

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That's true - rubber and plastic would degrade
in space over a long period of time, and the

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ISS has been flying for nearly 16 years.

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So, the rubber seals that prevent leakage
at the docking ports are attached to the visiting

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vehicles, rather than the station.

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This prevents the material from being exposed
to the harsh environment of space for too

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long.