There are 3D bioprinters but no 3D printed usable organs. Why is that? Microvascularization is a key rate limiter preventing humans needing an organ transplant from having it made available to them. In other words, blood needs to get to the 3D printed tissue in order for the tissue to remain alive. Thankfully, a start-up we have proudly supported from inception is developing the necessary tools to solve the microvascularization challenge so that we can have functioning 3D printed organs.