How to turn Adunio-based robot arm into a 3D printer

I found an amazing project on Instructables ,it use a robot am as a 3D printer,how precisely it is!



According to the instructables,I am trying to make a robot arm like this one.Fortunately,this robot arm project is open source.I can DIY one!!

But I want to make a Acryllc robot arm ,because it is cheaper.The acryllc arm will be as high precisely as the metal one? I'm not sure.Can you give me some advice?Thanks.

http://www.instructables.com/id/Dobot-Robotic-Arm-become-a-3D-printer-with-a-bowde/

http://www.instructables.com/id/Build-a-Laser-Cut-and-Soldering-Dobot-arm/

http://letsmakerobots.com/robot/project/turn-adunio-based-robot-arm-a-3d-printer

I just saw this project on Kickstater.But it last remain only 10 hours .

Edited 1 time(s). Last edit at 11/03/2015 11:06PM by dantewzj7.

If you want to print with a robot arm, you'll need much tighter tolerances and less bending than with a delta/cartesian/etc. This is because of the leverage -- a small amount of flexion at the base leads to a large displacement of the nozzle.

For this reason, acrylic would be too flexible. I would recommend against a robot arm; if you really want one, make it out of steel.