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If you want a good DIY copter or just a good line of sight trainer, check out the 3D printed version of the Woodie Copter. I put all the .stl files on Thingiverserse. https://www.thingiverse.com/thing:2781770 The frame is a combination of 3D printed parts and 1/2 inch dowels from the hardware store. It can be built as either a "+" or "X" copter. Included in the Thing files are all the parts both frame types, GPS antenna mounts, camera mounts, gimbal mounts and center sections for many popular flight control boards.
The frame size is easily scaled by cutting the sticks. I use 17 inch outer frame sticks which give a 24 inch diagonal, on trainers and night flyers. 14 inch sticks for X copters setup for video. The landing gear is pipe insulation which absorbs hard landings and allows the floats to be easily installed.
This printer should print all the files fine. It has a large print bed. https://hobbyking.com/en_us/tronxy-x-3-desktop-3d-printer-kit-w-auto-level-us-plug.html
These motors work great and I love the heavy shaft with the extra prop bushing. https://hobbyking.com/en_us/ax-2810q-750kv-brushless-quadcopter-motor.html
I like to use a 4 channel ESC to make the wiring easier. https://hobbyking.com/en_us/blheli-s-35a.html
Add your favorite flight controller https://hobbyking.com/en_us/drones/flight-controllers.html