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Single Motot Steerable Robot Bulldozer
3D Model Description:
This is a single motor 2 function remote controlled toy robot with tracks instead of wheels. It can move forward or spin in place for steering.
It is controlled by the transmitter and receiver from a Coke can RC car. It uses a yellow TT motor with dual shaft output. It is powered by 3 AA batteries. The hardest part of the build is the electronics.
The head has a sacrificial bridge that needs to be trimmed out. The head is glued to the torso and they are both glued to the main_body. The controls and headlights are also glued to the main_body. The grills are parts are glued to the main body so they can be printed in different colors. The grills are printed with a layer height filament change so they can be 2 colors. The parts that have to turn freely on 3mm screws will probably need to be drilled out with a 3mm or 1/8 inch drill. The 3mf file is a Bambu studio project file. The hat is held to the head with magnets for easy removal.
The tracks are print in place. I printed them on an A1 Mini at .2MM layer height and they come out working freely from the build plate. I printed them on an Ender 3 at .2MM layer height and they have to be freed up by cracking each link and then working them a little. Your mileage may vary.
As an experiment I have included a part called shell. It can be used as a cover that you can then glue parts to so you can make a customized version of the body without any 3d design skills. I have also included parts called plug_inner and plug_outer. They are not intended to be printed. They can be used to cut out clearance for the internal parts. In theory you could use a program like Tinkercad to add stuff to the shell part and then use the plugs to cut out the internal space. I haven’t tried it yet.
Hardware needed:
Coke can RC car
The hardware required is 3MM screws of various lengths
O rings from Harbor Freight O ring Kit:
Floating idler tensioner #006: ID 2.8MM, OD 6.6MM, Section 1.9MM
3AA battery box
Yellow dual shaft TT motor
2 red 5MM leds
2 resistors in the 100 – 200 Ohm range
4 magnets 6MM X 1.5Mm