Monitor Stand (Stackable)

The other day at work I was showing a new guy his computer, he asks me do we have any monitor stands? I said no we don't, a day later I walk past his cubicle to see he had some books stacked up for his monitor stand, it got me thinking I can print some stands and sell them to my co-workers for cost.

My objective was it had to be quick and easy to print because I would be printing a lot of them, while modeling them I had the idea it would be nice to stack them to give people height options.

Right now I have a 0.8 nozzle on my printer so that is what I based all my dimensions off of, the walls are 1.6mm thick so no infill needed and with the 0.8 nozzle at 60mms it prints in a little over 3hrs

I modeled some end caps I was going to do in TPU, but I haven't printed them to see if they will work.

Let me know if there is any way I can improve it.
Thanks and Enjoy.

Update, I forgot to put the height they are about 70mm or 2.8" tall