Wide Angle Lens Holder for diving

Update 16/1-25:  As someone rightfully pointed out there were some errors in the original design, so I corrected these (some internal planes that were not supposed to be there). 

Also, the  hook at the end (with the cut-away support wall) is changed slightly so it prints nicer, I hope.

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This holder, shaped as a cup and printed in TPU, is made to fit a Weefine wet-lens (0.45X) when not in use on the camera. It would normally be mounted on a torch-arm or on the hand-held rig. The cup has notches to hold the magnetic ring in place and a protective cover folds on top of the lens to secure it.

Additionally a short TPU lanyard is attached, to prevent the lens from dropping by accident. This is secured with a stainless steel ring or similar on the lens. 

The holder has a 1/4" nut inside to mount it. ( updated dimensions, slightly tighter fit!)

It is made to fit tightly, the TPU has enough clamping force, but not too much to release  the lens underwater when needed. There are holes in the cup to allow water to flow in and out. 

Printing with 4 base and 4 top layers, 3 perimeters and 20-25% infill. Printed on Kapton tape @ 50 degrees, hot end @ 230 degrees. 

The hook on one side has a thin wall from the build plate to lead up to it. I did this to avoid supports because they are often difficult to remove in TPU. However, the result is not optimal so supports could help here. The excess TPU needs to be cut away.

Attention; from personal experience I found that it is VERY important to use a  stainless steel nut in this model, and a stainless steel screw that is used to attach the lens-holder to your rig!

If you use other metals there is a good chance that the corrosion from (salt) water will release chemicals that can attack the coating on the glass from the wide angle lens!