I wasn't able to use the highly regarded screw organizers for the core one when I built mine, and looked for something similar for the INDX upgrade. I noticed there are two separate models (one for INDX kit hardware @wubbr, and one for the hardware you keep while disassembling your Core One @M3ro_2382879 ), but I wanted a combined version that could be printed all at once. It's not perfect, but it should do the trick. It has curved edges to reduce the corners lifting during printing, and a nice fillet in each compartment to help scooping out the parts with gummy bear fingers. 

Note that I have yet to perform my INDX upgrade, so this model is based off of the sizing and hardware listed from the models I linked for remixing. I have uploaded a STL, 3MF, and OBJ files so please, take and make edits as you see fit. 

This model has unique slots for each type of hardware used and keeps new / used hardware separate as well. 

My Print Settings: 

• Nozzle: 0.4mm

• Layer Height: 0.2mm

• Profile: 0.2 Balanced

• Filament: Polymaker Matte PLA (Army Dark Green) and Overture Matte Black

• 15% infill