OpenMV AE3 Focus adjustment ring
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Estimated printing price per file
€0.17 – €0.21 net (excluding VAT)
For file: AE3 Focus adjuster_0.4n_0.2mm_PLA_COREONE_13m.bgcode
This is an estimate for one file. You’ll confirm the exact price before ordering.
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File used for this estimate
Average indicative estimate: €0.19 excluding VAT (range midpoint).
- Weight reported by the author
- 2 g
- Print time reported by the author
- 12.6 min
- Source material
- PLA
- Estimate material
- PLA
- Estimate printer
- Bambu Lab P1S - 0.4 nozzle
- Estimate process
- 0.20mm Standard
Indicative estimate for the selected file only, based on the author’s weight and print time. File variants are not added together. The final price is calculated after file analysis.
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This ring is a wrench to grab the tiny 8mm lens and precisely adjust the focus without obstructing the field of view.
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Model information
- Source
- Printables
- Category
- Tools
- License
- Creative Commons — Attribution — Noncommercial — NoDerivatives
The problem
The OpenMV AE3 camera is tiny, but needs a manual focus adjustment to set the working distance. The lens of a tiny camera is, naturally, miniscule. You can grab the lens rim with your fingers and turn it to adjust the focus, but all you can see is your fingers obstructing most of the view. Attaching a permanent focusing ring to the lens isn't feasible, because just besides the lens there's a 3D-depth sensor and any kind of ring will obstruct that sensor.
The solution
This small ring is a slip-on slip-off wrench to engage the tiny teeth on the lens rim and help turning the lens precisely. The internal opening is slightly conical, so even if your printer isn't spot-on-perfect with calibration, you should be able to put the ring on the camera lens, just don't force it on - the internal spline on the ring will engage the lens just fine, turn the focus and take the ring off again once done.
If your printer is dead-on with the calibration (cough), then the ring will slide on until the integrated shoulder, which in turn prevents the ring from falling past the lens rim (see photo)
The camera case in the photo is in my designs - have a look there.
Printing
Print in PLA, 0.2mm layer height, structural.
Print multiple of these at a time - I do them in batches of four - to split print time over a few parts and minimize the risk of heat warping. The provided print file will make 4 rings and will take 15 minutes to print.