Step 1: Get lenses from disposible cameras
(CAUTION there is a significant shock hazard if you plan to open a flash camera from the capacitor!)
You will need to print out a different optical tube for the Kodak lenses vs the Fujifilm lenses, STLs for both are attached in the next step. I have tested this design with the following camera models:
Fujifilm QuickSnap Outdoor
Fujifilm QuickSnap Flash
Kodak FunSaver Flash
Kodak Max Outdoor
Use some pliers or otherwise to remove the faceplate on the camera and remove the objective lens. Once again, if you plan to get it from a flash camera, be really careful with the capacitor. Non-flash cameras are trivial. Take good care not to scratch the lenses.
Step 2: 3D print all the necessary components
Note: if you plan to use the smartphone adapter or even to prevent loss of focus, you can print the attached focus lock upgrade described later on. If you decide to do that, do not print the head included here in this zip file, use the one from the focus lock.
The light source shown in the photo is a low cost LED wall light from some box store.
Step 3: Install lenses and assemble optical tube
Step 4: Assemble the head and stand
Step 5: Optional Step - Focus Lock Upgrade
Step 6: Optional Step - Smartphone Adapter
Step 7: Have fun!
Wood DIY microscope and great theory section : http://www.funsci.com/fun3_en/ucomp1/ucomp1.htm
Laser cut version by ZombieCat: http://www.thingiverse.com/thing:31632
Looking forward to any feedback as well.