Many new printers don't have a unlimited budget when starting out, and building your own exposure unit is one way you can save money. For many, building a "home-made" unit is a source of pride and achievement. Another benefit of "doing it yourself" is that if anything ever breaks, you'll know how to fix it, since you built if yourself.

Even if you are only slightly handy with some common household tools like a drill, a screwdriver and a saw, you will be able to build your own exposure unit.