Hi everyone,

I'm new in 3D printing but really fascinated by this technology.

I am building a prototype for a Delta style robot with LEGO NXT and EV3 sets.

What I would like to use is a longer track rod for holding the gripper. The current design is using the following piece from LEGO:
[www.brickset.com]

I've attached a picture also.

Basically, I would like the same part double or triple in length.

How could I get started? Any tips?

Regards,
Cezar

If you know a 3D CAD (design) software, just draw it and have someone print it for you.

If you don't, just provide a quick sketch with all the needed dimensions, and maybe someone will take some time to create it in openscad for you.

Of course instead of having it printed, you could hack up a first version by assembling simple components or cut the short version in halves and extend it some way or another (glueing sticks, etc...). Then when your printer works, print replacements.

---

Most of my technical comments should be correct, but is THIS one ?
Anyway, as a rule of thumb, always double check what people write.

Its something like:

h=10;ch=7;w=5; l=30; r=3;t=2; //ALL THESE ARE WRONG
difference()
{   union()
    {   for(x=[l,-l]/2) translate([x,0]) cylinder(r=r+t,h=h); //The cylinders.
         translate([-l/2,-w/2]) cube([l,w,ch]); //Center bar connecting.
     }
      for(x=[l,-l]/2) translate([x,0,-h]) cylinder(r=r,h=3*h); //Cut out holes.
}

`h` is the height at the cylinders, `w`,`ch`, is the width,height at the center section,
`l` is the distance between the centers of the holes, `r` is the radius of the holes `t` is the thicknesses around the holes.

Stuff this into openscad save somewhere for the record, and change the values to what you need then hit F6 and export-stl.(I may be over pedantic now..)