I designed this part so that I could add walls to my Kossel printer. What I used for my walls is 3mm Corflute (you could also cut out cardboard box) cut to size and attached to the top and bottom of my enclosure. This helped with keeping drafts away from my print bed when printing ABS parts. Also doubles as a cable-tidy.
My particular printer is a micromake from Aliexpress and my walls are 600mm x 330mm cut outs including 20mm 90deg bends along the long edge to tuck into the clip.
Printed in PLA, 0.2mm, 200deg on 60deg heated bed