Self-Balancing Rolling Robot with bearings and counterweight

I love what @Judhini_1605028 did to create the original model. It was just too difficult to get it to roll smoothly. I added bearings and a counterweight. I like to create 3D models that follow these criteria: Do not require supports – I HATE supports. Print quickly – optimized for 0.4mm nozzle diameter with 2 exterior wall thickness Are easy to access for maintenance – I like to upgrade parts, but I hate to disassemble the entire model just to change out one part. Are chamfered on the bottom layer – this helps those who don't have a perfectly aligned bed and may still have “elephant foot” artifacts. Do not waste plastic – many designers make parts that are WAY thicker than are required for structural strength. This just makes the parts bulky and take longer to print. Notes NO SUPPORTS REQUIRED All parts print without supports. Tires printed with 95A Flexible TPU filament I recommend slowing down print speed and adding extra retraction. Requires 608-2RS 8x22x7mm bearings (qty 2). Amazon: https://www.amazon.com/SHKI/dp/B09PKD8QZZ AliExpress: https://www.aliexpress.us/item/3256804579616875.html Requires nut counterweight (qty 1) There are 2 versions: ½ inch-13 or M12-1.75 ½ inch-13 Amazon: https://www.amazon.com/Nuts-13-Stainless-Steel-10pcs/dp/B0BLBL8JS9 M12-1.75 Amazon: https://www.amazon.com/Glvaner-M12-1-75mm-Thread-Stainless-Hexagon/dp/B09B6VV7WM Building Instructions All parts fit together snugly without any glue or screws.