This is a remix of the cute "LCD 12864 Graphic Smart Display Controller Holder for 8020 T-Slot Aluminum Frame" by mcfada.
My issue with the original is that my IKEA lack does not accommodate the holder if mounted to the top horizontal support of my AM8. Hence I remixed the front component of the holder to enable mounting on the extrusion next to my hot bed. The back components is unchanged (but yet included here to make the delivery complete).
The thing prints out just fine. Just missed one hole - see above - in the first iteration of the design and had to drill it with a Dremel. Updated thing with the hole already loaded.
There is also V2 added by now: The initial thingi felt a bit sketchy due to the rather short support structures. The V2 edge continues down to the bottom edge of the 4020 profile and the supports have also extended accordingly. Have not printed V2 myself yet, but should be just fine.
There is also V3 added by now: Two screw holes for attaching to the vertical ALU rail side.
Velleman Vertex PETG
Support is only needed in one tiny place, which is good.