I like modular stuff and this was a great idea but I found the one by Duecki that had a flaw that made it not stackable since the part that connected them would break so I decided to upgrade with some sturdy puzzle pieces cut outs, not only did it made stronger but also made it so the core is only one part that you can reprint as many as you need. And instead of printing beginning and ends I made stabilizers to fit in the cut outs at each end. They are slim enough to slide under the side of the printer.