This is a 600TVL micro camera tilt mount for ZMR250 frame, SG90 servo controlled, for FPV custom build quadcopter. The camera itself is available in many stores (e.g. Banggood), small dimensions (12.5x12.5mm) and low price make it ideal for beginners.
I could not find low profile design, which can be mounted under FlySky receiver and at the same time being able to tilt camera forward far enough to see the ground when hovering or landing. As a pilot I'm an absolute beginner and I needed it really badly, so I've designed it from scratch in OpenSCAD.
Before mounting the camera, remove microphone and no longer needed audio cable (I have replaced all original cables as they seem to be too rigid). Then mount it inside frame using hot glue on PCB edges, leaving enough open space for proper cooling. It's a good idea to glue the cables as well, 'cause the solder pads that keep them in place are rather weak. And don't forget use 5V power source for the camera!
For both: camera frame axis and servo-to-frame connecting rod a 1mm piano wire can be used or (like me) you can use wire from straightened paperclip.
Warning: in my build ZMR's top plate is actually at the bottom, so check the position of mounting M2.5 screw according to your build. The position can be changed by editing OpenSCAD source or you can just drill new holes where needed.
Flight controller software configuration examples can be found on YouTube. Just search "pitch camera gimbal".
For visualization purposes I've used SG90 servo model created by Jens R aka "tecdroid" ( https://www.thingiverse.com/thing:1034309 ) - so all proper credits go to him.
Printed with PLA, temperature 200C, bed temperature 60C, layer fan at 80%.
Print with 3 or more shells to ensure rigidity.
The base plate is rather thin, so better use specialized glue (eg. Dimafix) when printing on glass - otherwise you risk breaking it when removing part after printing.
Depending on how well your printer is calibrated, there may be needed some work for adjusting dimensions of printed parts to "real world". Use Exacto knife / a file / whatever-you-need to put all pieces together. There is "tol" (tolerance) parameter in OpenSCAD source file that controls enlarging "internal" dimensions, like hole diameter etc. You can adjust it to your needs.
The STL files were generated with tol=0.3mm (the value needed by my printer to create accurate hole sizes).