First tool holder for the above:
LowRider 3 CNC - Add-on - KINEMATIC Pen Holder / Drag Knife Holder - designed for LR3 Dust Shoe (v4.0)
LowRider 3 CNC - Add-on - KINEMATIC Pen Holder - designed for LR3 Dust Shoe (v4.1) by Doug Joseph (design8studio) | Download free STL model | Printables.com
Based on @jamiek 's posted here: LowRider v3 CNC - Tool-less Quick-Change Accessory Holder / Tool Holder - for laser, drag knife, pen, etc (v3.0) - #60 by jamiek