The parts are designed in openSCAD so things are somewhat parametric. They are designed to use the bits of 8 mm smooth rod / threaded bar that are left over from building a RepRap (instead of 1/2" or 12 mm which is common in Physics labs).

There are two versions of the optical breadboard. The 'A' one uses quite a lot of material so I designed the 'B' one to use a bit less. Both trap M6 nuts (warm them up and push them into the pla for a tight fit!) and stuff get mounted to the opposite face.

The lensholder is setup for 25 mm lens/mirrors and needs 2 M3 nuts and bolts to hold it together. The holderbase is on two parts and the height/length can be varied. The laser holder consists of two rings which contain the laser pointer (using 6 M3 bolts and 6 nuts in traps) and this is coupled to the long section using M3 or M4.

The little semi-ring with the hole in it can be used to avoid pushing the pointer button accidently thus saving batteries/eyes.... or hold the button down constantly.

Up to date versions of the files can be found here: github.com/amk/LaserLab

Note: do not stare into laser beam with remaining eye ;-)