IPD (interpupillary distance) is basically the distance between the center of your two eyeballs. The average value is 63cm~65cm, which Oculus Rift DK is designed for(64mm). If yours is too wide or narrow beyond that you'll notice how the image in Rift doesn't focus too well horizontally, which is uncomfortable and may leads to sickness.
My IPD is extremely wide, 72mm (please, I'm still handsome). After a while's use I knew this is not something I can just ignore so I did some research. The problem turned out to be pretty common, this post shows plastic adapters user bwhill designed to adjust the IPD to specified value. But he's only selling 3D-printed products not sharing or selling the blueprint and it's too much of a wait to ship to china. So I penned a few lines and plugged in my heat knife, it's not pretty but it had the job done.
Why this is viable:
1. The damage is mild and recoverable if you decide later that a hole on it is just too much . 2. It doesn't affect the normal insert-lock-in-place function. 3. It works two-way, by a little rotation you can either wide or narrow the lens with just one hole, amazing. 4. Hot glue is cool, and if you didn't run out of duct tape you can be even cooler.
Possible cons:
1. Dust leak? 2. Changing lens frequently would be a hassel.
So yeah it turned out to be better than I expected. The experience is much, much more immersing. I didn't feel anything while moving fast before, after this mod I had some happy adrenaline going when I run. Not to mention my eyes feel more comfortable and no more sickness (this one doesn't count as I haven't used for hours before writing this in excitement). The result should differ from person to person, but if you have extreme IPD I highly recommend you to do something about it, either buy the adjuster or cut it open. Personally it's one of the most rewarding and cost efficient thing I've done this year, it extracted another 50% of the Rift.
