Here's my latest revision of a mount for the Access Port V3 - with the standard mount it comes with. I found double sided tape wasn't working very well, and nothing would stick to the bezel of the stack.

What you'll need:
M3 Bolt: 10 - 15mm long should be fine
M3 nut

Peel the double sided tape off the original mount, and it should slide into the slot (tip, if you're having difficulty sliding the original mount into the 3D printed mount, use a lighter to slightly heat the slot, then slide the original mount into the slot. Slide the bolt through the hole, put the nut on, then screw the bolt into the stub. There is also a small bit of support included in the design, it's pretty obvious what you need to clip off after printing.

After 6 revisions, the Solidworks file is a bit messy, but feel free to edit it if you'd like. I may do a rev. 7 when I print the ABS version for summer. Comment/PM me if you're interested in making changes or have suggestions!

I used a small bit of cork between the stopper and the stack bezel just to give it some extra grip and prevent any scratches.