Compact Owl Lens Holder

Hardware
1

So, I printed and assembled my first OWL unit about a year ago and just recently started production on the remaining 8 units a few weeks ago. I ordered the same lens filter that I used last year: Amazon.com : Tiffen 37UVP Slim 37mm UV Protection Filter for Camera Lens, Clear Optical Glass, Impact Resistant : Camera Lens Sky And Uv Filters : Electronics .

However I noticed that the STL currently on the Github repository seems to have been changed for a more compact filter design.

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Could you also post the old file as well?

Thanks for all the support!

2

I had a look at the commit history on Github and the Lens Mount.stl file was last updated a couple of years ago, so it’s unlikely to be this. Where did you get download the file from?

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There may be a printing or slicing error - double check those as well or perhaps the lens filter has changed dimensions somewhat?

What is the specific problem with them fitting? Hopefully one of these will fix it.

3

EDIT: Sorry I have called this the lens holder, but the filename is actually lens_mount.stl

I want to say that I got the file from the same Github repository but it sounds like the problem is on my end. I have been using the same printer ( Bambu A1) but I may have used another slicer program.I will try using some different software and see what happens.

The issue is the inside depth of the retention ring. The latest batch is much more shallow and doesn’t accept the entirety of the lens cover.

Thanks for taking a look! I will do some more digging on my end and see what I can come up with.

4

So after trying a different slicing program, I got the same result. The lens mount was 1.5mm too shallow for the UV filter. I took the current model and modified it. It is a little thicker but otherwise seems to work. Is there a way I can upload the STL in case anyone else encounters the issue?

5

That’s quite curious - I checked the TinkerCAD 3D model with that on the Github repo and they are identical. I am quite confident it hasn’t changed. Unfortunately, I can’t seem to find any 3D model files for the Tiffen UV Filter to double check this.

Can you measure the thickness of it? Did you download the model directly from the repo and print it?

6

I love TinkerCAD!

I don’t think it has changed either, I did download and print directly from the repository. The preview on Github looks just like what is printing out too. I tried to find the STL from last year, but I downloaded the repository when I started this year and overwrote the old files.

I just measured the Tiffen filter; it is 6.75mm thick.

7

Ok that’s good - I always get worried I’ve accidentally messed up a file when I make changes :sweat_smile:

Thanks for measuring it, I’ll check dimensions on the K&F when I get a chance tomorrow. I imagine its most likely just a small lens difference.

TinkerCAD is great! All files here were made on it, but I’m working on doing it all in OnShape now. Much more powerful and something I really should invest in learning.