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Nicholas Seward made an update post about Simpson family of printers with some recent developments:

Today was a huge day for the Simpson family.
It started off with a post from +Solidus Labs that showed the GDR's (a worm drive Simpson derivative) first print.

It was quickly followed by my friend +Danny Dd getting his carbon fiber LISA Simpson printing for the first time.

I did some updates to my GUS to reduce drag in the bowden tube. That paired with updates to my gcode preprocessor allowed me to do a reasonably big print. I hope to up the size of some of my next prints even more.
Simpsons are still very experimental but progress is being made daily. It will be very exciting to see how Simpsons evolve during 2014.

This wonderful project is advancing, Lisa is printing first good objects.
Here is first post about RepRap Lisa with more details:

http://diy3dprinting.blogspot.com/2013/12/reprap-lisa-simpson-makes-first-moves.html

Update:

Here is a video of RepRap Lisa printing upside down:

Nicholas Seward does it again. LISA (LInear Simpson Alternative) makes first moves in this video.




The design goals of the RepRap Lisa Simpson project are:

• Make a Rostock style bot that is capable of high speeds with a threaded rod.
• Minimize the number of components.
• Eliminate all spherical joints in favor of 608 bearing joints.
• Eliminate the smooth rods and linear bearings if possible.
• Look cool.
• Mount the steppers as low as possible.
• Eliminate all unnecessary supports.

Development forum with in-depth infromation:

http://forums.reprap.org/read.php?178,267835

Update:

Lisa is now printing good parts:

http://diy3dprinting.blogspot.com/2014/01/reprap-lisa-makes-first-good-prints.html