I am going on a trip soon and wanted a simple grip that I could use with my DJI Osmo Pocket 3, and I couldn't find one. So, I went ahead and made one using parts from other models I found along the way (linked at the bottom).
This grip system is meant to be incredibly simple and not require any additional parts (unless you need the screw). The DJI will fit “snug” into it's holder, and if you need an extra level of security, there is a hole on the bottom-side for a screw to be inserted.
If you print it, hope you like it! I may design and upload my own custom version in the near future, depending on how this trip goes.
Parts List - 3D Files - a complete grip consists of:
Parts List - not 3D Printed:
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Printing Instructions
I suggest printing the parts using the following settings:
3d Models Used
The author remixed this model.

DJI Osmo Pocket 3 Video Grip | Just used as reference
DJI Osmo Pocket desktop stand | Embedded part into model
Handle grip | Embedded part into model