Small hook that is print in place with a latch to increase the strength of the holder. This is based on my other design. I hope its helpful to you. I uploaded the stl and the 3mf. Let me know in the comments if you would like the .step file.

This design is based on my design below.

https://www.youtube.com/watch?v=pGPCKg7630g&ab_channel=Hesed

(Not needed) Slicing Recommendation Notes:

1. I recommend checking the “Avoid crossing perimeters” option, found below. This will help avoid knocking the hinge part off the bed:
   (1)Print Settings (Expert)→(2)Layers and perimeters→(3)Quality (slower slicing).

    You can find this setting already selected on my 3mf file.

2. This is not required but a small support enforcer will help the “holding” part of the latch print clean. You can use a small support enforcer to make this happen.

You can find this setting already placed on my 3mf file.

Creality

Ender 3

No

Doesn't Matter

0.2mm