A dovetailed modular ER-25 collet holder. Ultimately, I want to add a lid to make it a box as well as just use it for organizing the collets on my workbench.I wanted to print the box in the derivative tag but I couldn't fit the ER25 sized version on the bed of the Makerbot. So, I modularized it...Print the file(s) above depending on how many you want to string together. Assemble. Enjoy the organization. :-)