In this case, the SCAD code of the Scout printbot has been converted into OOML code ( iearobotics.com/oomlwiki/doku.php ). At the same time, the ScoutMega printbot derives from the MiniSkyBot ( thingiverse.com/thing:7989 ) by Obijuan ( thingiverse.com/obijuan ). The castor wheel in the rear part is the same as in the MiniSkyBot, but the OOML version ( thingiverse.com/thing:12198 ) by avalero ( thingiverse.com/avalero ) was employed.

Here is a small video (in spanish): http://www.youtube.com/watch?v=821ua42vHks

The main design is the same as the Scout printbot, but an additional front bumper has been included in order to mount on it a gripper. The gripper selected is a modification of the one posted in ( thingiverse.com/thing:2415 ).

The electronics consists on an Arduino Mega board and 3 Futaba S3003 servos (for both wheels and gripper).

In the attached files, all the source code is provided: SCAD files and STL. There is algo a C++ file in which it is the code of the chassis using the OOML.

Additional things: To assemble everything, you will need at least:

• 11 M3x8mm screws.
• 4 M3x20mm screws.
• 14 M3 nuts.
• 2 O-ring: 50x3 mm.
• 1 O-ring 16x3 mm.

Realize that for the gripper I just used some plastic wire. You can do this as well but if you want to use screws (for a more robust coupling), you will need:

• 6 M3x6mm screws.
• 6 more M3 nuts.

TO DO:

• The gipper is too big according the size of the chassis. This make the printbot unstable sometimes.

• Change the design to make it easier to assemble.

• Improve the gripper anchorage. Right now it is very difficult to assemble.

I'm sorry about this issues. That is what happens when an electronic design mechanics :)

• Download the zip file.

• Print all the STL files (look at the quantity of each part). In my case, the chassis was printed in two parts.

• Assemble all the printed parts.

• Hack the two servos you are going to use for the wheels.

• Mount two hacked Futaba S3003 or equivalent servos to the bracket. Mount another one (not hacked) on the gripper.

• Mount an Arudino Mega (to mount a smaller version the mounting holes should be changed in the ScoutMega.cpp file). Maybe you need to add some weight on the rear part... the printbot is a little bit unstable.

• Wire and program the Arduno.

• Play and have fun!