This is an upgrade for your Transformers Titans Return Fortress Maximus or Grand Maximus. It holds 2 Prime Masters. The part fills a gap in the chest compartment.
To install, open the red door that is on the top of Fortress Maximus' torso. Insert the part into the opening. Push the part forward through the gap from the back. The part will stay in place with friction.
This is intended for adult figure collectors. This is not designed for rough play by children.
Depending on the plastic you choose, sanding or polish may be needed to fine tune the fit.
This has been tested with my home 3D printer with PLA Plastic.
For a Single Matrix Holder, Please see my other product here:
https://www.shapeways.com/product/5Q9DY6828?key=dcf9b9cf1dbd6698c55f5a16c296702f
For a set of replacement parts for Fortress Maximus' head crest, please see my other product here:
https://www.shapeways.com/product/7CV6GZN87/tf-tr-fort-max-head-crest-replacement?optionId=240394051&li=shops
For the Handle Retainer for Metroplex's Red Cannon, please see my other product here:
https://www.shapeways.com/product/GL3ATCTJX/tf-generations-titan-rifle-handle-retainer?optionId=176624363&li=shops
If you need replacement shoulder ramps for Fortress Maximus, Please see my other product here:
https://www.shapeways.com/product/536632SNH/tf-tr-fort-max-shoulder-replacement-ramp