A Cub-style landing gear I designed for an RC DIY bush plane I built. The plane is 120 cm in wingspan an has a total weight of about 1 Kg. But I think this landing gear to fit other planes that are both smaller and bigger than this. The size of the landing gear can easily be adjusted by choosing different lengths of carbon fiber tubes and reds to fit the specific plane. I have made a couple of takeoffs, flights, landings, and a lot of taxiing on a bumpy grass field. So far it is holding up fine.
Solid 4 mm carbon fiber rods are used to connect the different 3D printer pieces. The telescoping parts are made out of 1 mm carbon fiber rods inside carbon fiber tubes with an inner diameter of 2 mm and an outer diameter of 4 mm. For the "shock absorbers" in the suspension, I used an old bicycle inner tube which I cut into "rubber bands". Use more rubber bands for heavier planes. All plastic parts are glued to the carbon fiber parts using CA glue. Don't glue the parts that should be able to move!
I used wheel axles from hobby king, link: https://hobbyking.com/en_us/steel-axles-d4-x-l57-mm-x-m5-5pc.html
Apart from the wheel axles, some other screws are also needed. I used small M2 screws and nuts to connect the telescoping suspension rods. The inner screws also act as the inner mount for the rubber bands in the suspension.
To make one landing gear you need to print:
For mounting the landing gear to the airplane you will need:
2x holderType1 or 4x holderType2
The "angleSpacer" can be used to thread over the 1 mm carbon fiber rod in the suspension to find adjust the angle of the landing gear when it is not compressed. You can scale this spacer (only scale Z) to fit perfectly, or if you manage to make the carbon fiber tubes exactly the correct length you don't need this spacer at all.
I used Autodesk Inventor (student license) to create this. Inventor files are included in the download.
0.08mm layer height, 0.4mm nozzle
any brand PLA
Print all parts solid with the finest resolution you know that your printer can handle reliably.