We have built on our expertise in adapting different print heads and other add-on modules to existing machines, and created our own machine for functional printing on 3D objects. This capability is currently for our own use on development projects. However we are developing the machine for sale. If you are interested, please email us at email@example.com.
There are a lot of advantages to printing directly onto physical objects in certain circumstances. The construction can be much more robust in terms of bonding to the object, high temperature environments, etc.