USB_Holder_D50 v4

This is remix of Lalo_Solo's excellent design of USB SD and MicroSD holder for wide USB sticks. I needed a place to store my usb stick caps. some other remixes have included that space, but located it in front of the micro sd slots, or on the ends. I wanted the storage area behind, so remixed to this. I completely rebuilt it and included the 3mf and step file if anyone wants to remix more easily. Thanks Lalo_Solo! what a great idea!