Building Siren a 150g Drum Spinner Combat Robot (UK Antweight US Fairyweight)

I designed this drum spinner combat robot in TinkerCAD. Files to print your own can be found on Thingiverse: https://www.thingiverse.com/thing:316.... I called it siren because of the sounds it makes as it spins. I am still tinkering with a true whistle or siren to incorporate into the drum itself. So far I've had success when spinning in reverse. I think I'll have to do away with the teeth to get he right airflow. Siren was designed to maximize the size of the drum spinner. The wheels are protected and their location make driving inverted possible. The bot can also self right, thanks to an idea I took from the Sgt Cuddles design. While inverted, high throttle the drum quickly. Items needed to complete the build and some instructions: n20 motors. Motors simply slide into the motor mounts and are held securely. No screws required. Thanks to https://www.thingiverse.com/thing:154... for this inspiration. (https://www.aliexpress.com/item/12MM-.... Use 2 300rpm, 500rpm or 600rpm motors. Corresponds to 50:1/30:1 gear ratio. DYS BE1806 2300KV Brushless Motor (https://amzn.to/2q5JfXO or https://www.banggood.com/DYS-BE1806-2.... Press fit into the drum. Use tape to protect the wires from the drum spinner. 3mm bearing (https://amzn.to/2CVYfQp) and an M3 lock nut (https://amzn.to/2ScA44m) and M3 x 16mm screw (https://amzn.to/2SfG38S). Press fit the bearing into the drum. Use a small amount of glue to keep it in place or melt the plastic around it. Additional screws are used to make teeth in the drum (flat tops are best: https://amzn.to/2CXV8aF) and for the bottom to adjust he height of the drum from the floor (round tops are best: https://amzn.to/2RaUoCb). I've been using a variety of different screws here and sometimes none at all. Polulu 40mm wheels (https://www.pololu.com/product/1452). The wheels need to be put onto the motors AFTER the motors are installed. There is room to slide the wheels down and onto the axel. The wheels should be adjusted again once the top is placed on. DasMikro 2S6A Micro Dual Bi-Directional Speed Controller: https://www.banggood.com/2S6A-Micro-D... or https://www.aliexpress.com/item/1PC-D... ZTW Mantis or Mantis Slim 15A SBEC 2A/5V Brushless ESC: https://amzn.to/2q3ppw4. The slim version is just over 6g (https://www.banggood.com/ZTW-Mantis-S...) and the larger version is 10g. The slim version goes in an out of stock at various merchants. 2s Lipo batteries: https://amzn.to/2CUCvVb or from HobbyKing directly. FS2A 4CH AFHDS 2A Mini Compatible Receiver : https://www.banggood.com/Flysky-FS2A-... Transmitter: Flysky FS-i6 for use with the above receiver: https://amzn.to/2R2NqPm Or if you want something compatible with multiple protocols including the Flysky one above and also spectrum and frysky: https://amzn.to/2R2Nxug or https://www.banggood.com/Jumper-T8SG-... The products linked above to either Banggood or Amazon affiliate links. There is no additional cost to you to purchase the products through these links. However, I make a small commission on any purchases made through the above links. I am not provided any of the above products for free to review or make videos about. I make the videos for fun and as part of my hobby experience.