Stand for Two Monitors

My work requires the use of three monitors. Due to company restrictions on the hardware I can use, I've purchased 2 portable external monitors and have these attached to my laptop. Unfortunately, these extra monitors take up a significant amount of desk space. I also wasn't able to get VESA-compatible monitors that could be easily mounted via an existing monitor stand.

So I created this stand that hangs the monitors vertically, one above the other.

The print consists of multiple parts attached to a 2 foot long piece of PVC pipe. The stand is attached to the desk using either a standard C-Clamp (such as this) or via a printed C-Clamp (such as this). Ball joint connectors allow each monitor to be adjusted slightly once mounted.

The Printed Parts:
(The letters correspond with those shown in the Breakout diagram)
(All pieces are printed in PETG. Please refer to the GCode files for best printing orientations, infill values, brims, and the very small amount of support needed.)
A: Cap: This piece covers the top of the PVC pipe. (Print 1)
B: PVC Washers: These pieces are curved on one side to match the curve of the PVC pipe. (Print 4)
C: Nut: Attaches the Bolt to the PVC pipe. (Print 2)
D: Bolt: Attaches the monitor pieces to the PVC pipe. (Print 2)
E: Ball Joint Nut: Attaches the Bolt to the Monitor Hanger pieces. (Print 2) 
F: Ball Joint Hinge: Links the Monitor Holder to the Bolt. (Print 2)
G: Monitor Holder: Holds the monitor to the stand. (Print 2).
    This piece is sized to the monitor.  To size for your monitor, measure the height of the monitor in mm, then add 17.75. Once the Top and Bottom mounts are printed (H and I below), these pieces should be assembled and tested for fit on the monitor. They should be snug to securely hold the monitor. Adjust the height of these pieces as needed for your monitors. PLEASE DON'T SKIP THIS TEST. 
H: Monitor Holder Top: Holds the top of the monitor to the Monitor Holder. Adjust this piece to be the depth of the top of your monitor. Note that you won't scale the entire piece, but only the amount of it that touches the monitor.
I: Monitor Holder Bottom: Holds the bottom of the monitor to the Monitor Holder. This piece is sized to the bottom depth of your monitor. Adjust it as necessary, following the same rules above for sizing the Monitor Holder Top.
K: Base: This piece holds the rest of the monitor stand together. It is held to the desk using a C-Clamp.

The Other Parts:
(The letters correspond with those shown in the Breakout diagram)
J: PVC Pipe: 1.5 inch OD (outer diameter) x 24 inches long.
Not Shown: 3 small screws (1 attaches the Cap to the PVC, the others attach the PVC to the Base)

Tools:
1. Drill with ¾ inch (19 mm) drill bit.
2. Holder for safely drilling two aligned holes in the PVC pipe.

First Steps:
(If you want to paint the PVC, do so either now or before starting the Assembly section, since it will be difficult to paint once put together.)
1. Add the heights of the two Monitor Holder pieces, in mm, then add 70 mm. Cut the PVC to this length.
2. Attach the PVC to the Base and use 2 small screws to secure it.
3. Attach the Cap to the PVC and use 1 small screw to secure it.
4. Mark the PVC in two places for the holes to be drilled: 
4a.  Add 15 mm to the height of the lower Monitor Holder. Mark the PVC.
4b.  Add 15 mm to the height of the upper Monitor Holder. Measure from the mark made above and mark the PVC again.
4c.  Drill a hole in the PVC at each of the two marks, using the ¾ inch drill bit.
5. Smooth the rough edges of the holes with sandpaper.

Assembly:
1. Take a Bolt and add a Ball Join Nut to it, ensuring the threads of the Ball Joint Nut are facing away from the Bolt. In the Breakout Diagram, the Ball Joint Nut threads are near piece F.
1a. Add a Washer to the Bolt, ensuring the curved side of the Washer faces the Bolt's threads.
1b. Push the Bolt assembly through the lower hole in the PVC.
1c. Add a Washer to the Bolt, ensuring the curved side of the Washer meets the PVC.
1d. Secure the Bolt assembly with the Nut. The Nut should be tightened with only your fingers.
2. Assemble the upper monitor hanger in the same way.

For each monitor:
3. Slide a Ball Joint Nut into its slot on the back of the Monitor Holder.
4. Attach a Monitor Holder Top into its slot at the top of the Monitor Holder. Use a small amount of glue (I prefer Gorilla Glue) to hold this piece in place. (If you skipped the testing step above and find your pieces don't fit, you'll need to adjust them and print again. Hence the reason you should test the fit of your monitor to the Monitor Holder, Monitor Holder Top, and Monitor Holder Bottom pieces.)
5. After the glue is dry on the Monitor Holder Top and Monitor Holder Bottom, this assembly can be fitted to the back of the monitor.
5a. Slide the assembly half way onto the monitor, so it is balanced and hangs squarely.
6. While holding the monitor and its holder, insert its Ball Joint Hinge into the Ball Joint Nut already on the stand and tighten it with your fingers.

As a final step, connect necessary cables to your monitors and adjust their hang, noting that the ball joints allow for only a minor adjustment.

Notes:
1. Close inspection of the photos will show that the holes I drilled were not aligned exactly. Even a small variance in the alignment can be noticeable.
2. The only difference in my monitors is in the depth of the Top and Bottom pieces, which is why I was able to have a single size Monitor Holder for both monitors. If your monitors are different sizes, you may have a different configuration of Monitor Holder, Monitor Holder Top and Monitor Holder Bottom pieces. You should plan to print various test pieces to get the best fit for each monitor.
3. The Monitor Holder Top and Monitor Holder Bottom pieces print with lettering on their ends indicating which of my monitors each was to be used for. These labels can be ignored.

Future Plans:
1. The design should be expanded to include wiring holders, which will direct the flow of the cables to the rear of the stand and from there to their destination. This will give a cleaner appearance to the design.
2. The design of the Ball Joints should be expanded to allow for a greater movement of the monitors.