With Build-A-Battle-Bot we want to encourage you to design and build. So, we thought what a better way than to have a quarterly contest for new attachments & designs.
Current Quarterly contest runs September 1st to November 30th 2025 and will be announced December 1st 2025
 
This package includes all the hardware you will need to design and build a drum around parts that you design and 3D print.
 
Included:
100mm shaft
plastic bushings X2 (4.5mm diameter)
 
Rules & Info
Open Source 3D Print .STL Files 
3D Printed with 20% PLA Infill around 10g in weight
2" to 3" inch Diameter
3.125 inch length
4.5mm hole for plastic bushing (Shown in white on beater bar picture)
Use the 50mm shafts, rubber feet & plastic shaft collars from your other weapons to mount 
Use the beater bar clip to design the drum around
Here is a search I did to get some ideas