After discovering that my son had been riding the garage door, I also discovered my garage door no longer worked and needed a new drive gear. The gear I designed doesn't look exactly like the official replacement part but worked fine for me. I tried printing it in ABS but couldn't get a handle on the heat balance between making the part stick and melting the teeth of the gears. I ended up printing it in PLA and it printed perfectly. Use 100% infill because the garage door motor puts a lot of stress on the part and someone may try to ride the door.