I printed it on its back, but it does require some support for the gap where the PTFE tube goes. The model is well-designed. I tried attaching it to my Neptoon 3-plus. It will connect with some T-Nuts and M3x20 screws. But the runout sensor can't move freely enough and the filament binds. I would not recommend this for the Elegoo 3-plus.

Just printed the adapter to hold a ptfe tube on either side of the filament sensor. Printed well, works for what I need. Mine seems like the ptfe tubing doesnt -quite- line up with the filament sensor but it works fine. Thanks for the design! (edited)