Flexible Spider Shaft Coupler with Hot Glue Spider

While I think the original Printrbot Z axis shaft coupler is clever, I don't really like it in practice. Mine periodically slipped on the shaft and ruined my prints.

As you can see the finished product worked well enough to use on my Printrbot. But it is worth noting that there is no vertical support when you use these, you can just grab the printer's z axis and lift the entire thing straight up any time. So you have to be careful to make sure you don't disturb your printer too much while