I love kbricks!
This is a base plate that fits a Nerf tactical rail that fits 2 cubes worth of kbricks.
Slide some connectors in the slots, and then you can attach kbricks to the top.
Thanks for the suggestions so far. If you made it and you have any comments that might help me improve it, please let me know! I'd love to see any makes.
Update: Added longitudinal notch.
Update: Added versions that are 2 and 3 cubes long. The 3 cubes version is a bit too big to fit on a Strongarm, so you will probably want the 2 cubes version.
You will probably want to print right way up with supports. As described on the kbricks page, it is probably worth drilling out the connector slots with a 4mm drill bit to make sure the connectors fit.