An alternative Cable Chain adapter for Ultimaker Original DIY heatbed
This is an alternative UMO Cable Chain adapter if you wish to use Robert's UM2 ...cable chain: https://www.youmagine.com/designs/ultimaker2-cable-chain
This design is meant for DIY heated beds. Attach the chain adapter to the mounting bracket with your favorite adhesive, then use the existing M3 screws to attach the bracket to the build plate arm.
3d model print parameters
Filament of your choice, extra wire extension if necessary...