Hybrid ogoo-printed small robot wheel

thingiverse

Build a small 3-wheeled Arduino Nano-controlled robot with this rear wheel. The wheel, featuring a 30mm diameter, is made from a printed 2-part hub and an ogoo tire that molds in place. Supplied are the molding forms for the wheel. After printing, assemble the hub halves, which are six-sided to perfectly fit the ogoo after it cures. Fill the mold halves with ogoo while the hub halves are in place. Cure the wheel, remove from the mold, and insert a brass 4mm OD/3mm ID tube as bearing and a 3mm screw as axle. The wheel dimensions measure 30mm x 20mm (OD x axial width). For proper radial alignment, ensure the mold halves are aligned correctly; any offset is due to improper alignment in the example wheels. Ogoo is an affordable, easy-to-use DIY silicone caulk-based molding material. To make your own ogoo substitute, visit http://www.instructables.com/id/How-To-Make-Your-Own-Sugru-Substitute/. Print two of _RearWheelMold.stl for the mold and two of _RearWheelHub.stl for each wheel you want to build. If necessary, sand the mold top sides. Insert each hub part into a mold part, which should fit easily with minimal tolerance. Fill each mold half with ogoo, ensuring proper placement of the hub part and eliminating air pockets. Press the mold halves together, align them correctly, and let the ogoo cure (30 minutes to an hour). Carefully open the mold, remove the wheel, and trim any excess ogoo from the gap where the mold halves connected using scissors. The code for this robot's other parts will be posted after some cleanup.