In the case of Anycubic I3 Mega, when printing at least 15 cm high, the cable will hit the top frame. It is a guide to escape this.
The attached data of FreeCAD is attached, so please print it with your favorite width. I printed 6 pieces of 3mm and 1 piece of 5mm.
This explanatory note is a machine translation of Japanese to English by Google translation.
no brand PLA
You may need a raft or a brim if you want to make it wider.