Step 1: Things you will need
the images show you what you need.
- you will also need (but is not shown in picture
- soldering iron
- shrink tubes
- lighter
- 5 volt power supply
- usb cable (to program you’re arduino)
info on the foamed pvc sheet
This is a material that is very easy to cut whit the stanly knife.i found it at the local hardware store.its 6 mm thick and is 50 cm on 100cm in dimension.if you can’t find this you can also use 6mm thick plywood.however you need to apply a layer of varnish to protect it against water
info on the motor
the 28byj-48 stepper motor is used because it have build in gearbox and have (relatively to its size) a high torque
it is found on ebay (or other site’s) for around 3 euro’s. most of the time the ULN2003 Driver Board is included when you’re buying it.
info on the arduino
basically you can use any 5 volt arduino,i used a nano because otherwise it will not fit inside the box
Step 2: Making the motor coupling
Take you’re silicone cap and cut off a small piece on the narrowest side
press the cap onto the motor axis
make sure it is a snug fit
its better to cut of a small amount of plastic at a time and check if the axis will fit
then put the dribit into the other side of the cap
Step 3: Preparing the box
glue the plastic sheets off 5×7 cm together
take you’re sheets of 7×7 cm and place them in a V shaped way inside the box
NOTE THAT THE LENGHT OF THIS SHEETS DEPENDS ON YOUR DRILLS LENGHT
(SEE PICTURE FOR DETAIL)
then glue the plastic sheets to the box as shown into the picture
Step 4: How to glue the peaces in place
this step shows you ho to glue the plastic sheets into the box
this is (i think) pretty self explaining
make sure you seal all the seems with glue
if i only had a 3d printer this would make this much more professional looking 
Step 5: Inserting the drill
drill a hole just above V shape with the drill bit that will be embedded into the box
also go trough the two plastic sheets KEEPING THE DRILBIT STRAIGHT
after the drill is in place make sure you can spin in free whit your hands
if not make the holes a tiny bit bigger
Step 6: Assemble the Drill Bit Assembly
put on you’re gloves and start to knead the glue stick (i used a halve portion)
drop a little ball into the large end of the cap and put the drill inside
press firmly
next put the rest of the glue around the drill and the cap
keep the drill and the cap perfectly aligned
cut of the glue while it is still soft to make a flat edge
Read more: The “all in one box” aquarium feeder using Arduino