I've been experiment with the design of the laser holder, since there was no open source design of it so i've decided to make it myself. 

We started with this holder as inspiration. Though it would have been better to make it with aluminium for finer control but acrylic sheet is all we had available. 

First started with a basic vertical alignment with having a plate that was curved from the bottom edge and added two screws such that they were opposite to each other with a spring for providing tension. When one of the screws is tightened, it pushes the vertical plate a bit forward curving the laser beam up or down. 

Here is the auto cad design of it which was laser cut. Note this is only for the top and bottom plate but not the vertical.  

Before fitting the screws here's how it looked. 

For the bottom plate added two plates on top of each other where was one attached to the holder and was fixed, the other one on top is movable. it also has two screws opposite to each other providing tension and works on the same principle as the vertical one. 

This gave us the ability to align the beam and to correct its inherent bending of the beam due to the structural drawback of the laser. 

This holder was integral in aligning the beam on the xcube. 

There are a few things that could have been better, instead of having a hex nut embedded in the plastic a brass insert would have been better. Instead of having the plates lying directly on to the other plate it would be nice if they were free to provide finer control.