*Yes, these are compatible with any roadrunners with the square attachment. This includes rings and pencil buddies.*
Parameters
Download the Attachment Cube STL.
Import the Blank STL into Tinkercad and DO NOT CHANGE THE SIZE OF IT.
Using the iPad or any method of 3d Modeling create an accessory with the following measurements.
1mm Height (before putting the attachment cube on)
30mm length (up and down if it's attached.)
20mm width (side to side)
After making your accessory above, place the attachment cube on the BOTTOM of your accessory.
NO GUNS (Unless they're really obviously funny, but this is school so don't be realistic at all.)
The beige is my "backpack" accessory.
The pink is the attachment where it will fit into the roadrunner.