4 tier adjustable card holder & optional features

A 4 tier adjustable card holder with optional pen holders at either the front, back, or front & back. I've also included a top cap which accepts up to 1mm thick stock for signage. It's easy to print and assemble, with no supports required. I've added an larger shaft for holding 6 card trays. The card trays are designed to hold cards up to 98mm wide.