Re: LISA Simpson

I found 4 more lead screw driven delta printers for a total of 5 not counting Lisa.
Each of these lead screw delta printers use a guide to prevent the nut from rotating, (i.e. a constrained nut).

Constrained nut advantages:
I'm assuming that these printers could replicate themselves, and
compete with the Cartesian printers on accuracy and precision of geometric shapes.

Constrained nut disadvantages:
I'm guessing that these early variants of a lead screw driven delta printer were not adopted
by the masses because the printing process was unbearably slower than a Cartesian printer.






Lisa advantages:
Utilizes a lead screw with a high rate of twist which allows parts to be manufactured at speeds comparable to a Cartesian 3d printer.
Has the ability to move a heavy mass at the end effector.
The enclosure can be heated without electronics, or stepper motors being exposed to the heat.
Low project cost to build volume size.
Easy to envision building.

Lisa disadvantages:
Lisa can't print a cube, cylinder, etc. with tolerances less than 1.0 mm for a cube, and significantly more for cylindrical objects.
Lisa is not able to replicate its self, or another RepRap 3d printer.

Question:
What solution will help Lisa to produce a more precise, and accurate geometric form? :
1. Software, (e.g. additional preprocessor g-code).
2. Constraining the nut from rotating, (e.g. a pickle fork).


Links:

Helium Frog Delta Robot
[reprap.org]

Helium Frog Delta Robot - First Steps
[www.youtube.com]

Helium Frog Delta Robot
[forums.reprap.org]

Viktor's tripod
[builders.reprap.org]

SpoonPod
[reprap.org]
[forums.reprap.org]

Festo iFab
[www.festo.com]