Printing Easel with Trichrome holder [F360 adjustable size]

I created this simple easel for printing RC/FB papers, with a special twist of adding a small holder where one can mount a second sheet, to mark spots for trichrome printing (Printing RGB layers separatly).

The base STL that is attached is for 12.7x17.8cm Paper with a 5mm border. But you can download the f3d file and adjust the size to your needs. (See section below)