In this Instructable I will show you how I built a simple dolly that is quite stable but most important pretty cheap to build. For all the parts I payed less than 20€ and if you have some rollerblades wheels lying around at home the price to pay for this project becomes ridiculous. Of course you will need the access to a 3d printer.

As it's pretty simple to build I encourage you to customise this project and evolving it. :) Have fun!

Step 1: What You Will Need

To build the dolly you will need this parts:

A 1mt long M8 threaded rod that later you will need to cut in pieces 1€
18 M8 nuts and 8 auto-locking M8 nuts0.50€
3d printed parts(I used red PLA, infill 80%) less than 0.50€
4 rollerblade wheels 76mm 12€
8 608zz ball bearings3€
A "photographic screw" free from the tripod
A ballhead free from the tripod

You will also need these tools:

An hacksaw to cut the threaded rod
A file to round off the 3d printed parts and rods ends (optional)
2 13mm wrenches or in alternative only a wrench and pliers

If you use my .STL files for the 3dprinted parts you will need to tap the holes with a 8mm or 9mm drill bit.

Step 2: 3d Printing Time!

Design your own parts or download mine, I used a program from Autodesk called 123D which is simple to use but at the same time it gives you a lot of "design/engineering power" :)

The parts were printed in 2 hours on prusa i3. PLA, 50mm/s, 80% infill.

Here is the link to the download page: http://www.123dapp.com/123D_Design/3dprinted-dolly/4223092

Step 3: "Metal Working"

Just cut the 1mt rod in 2x 20cm rods and 2x 25cm rods.
A good habit is to file the ends of the rods to make it simpler to screw on the rods the nuts.