I have now built a more stable landing gear based on this landing gear https://www.thingiverse.com/thing:865739. It's a repair landing gear that has the engine screws attached.
- Left and right leg without support
- Rear frame with support and brim as pressure plate
- I would print it with ABS, but should also be printable with other materials
or you can watch the 3D: https://www.thingiverse.com/thing:3433090