This handle will be part for another project (Underwater Camera Rig) but I made them to be used also for other occasions like replacement handle for wheelbarrows, etc.
The inner diameter is 30mm and depending on your TPU filment, it might make sense to resize it for X and Y directions.
I used Geetech TPU 95A and noticed that it needs to be scaled down by around 0,7 % for X and Y
Length is 120mm
There is also another STEP file attached where the bottom is extendd by15mm, so total length would 135mm

The printprofile has been optimzed for Geetech TPU 95A black, if you have something else, please do your homework first.
To get an idea how to do that, see here