This is a toothpick quad with 8.5mm motors and 55mm props. Its made to house a whoop sized FC (26 x 26mm).
The battery holder needs to be mounted with the opening towards the back so you can access the USB port. I installed a Beecore V2.0 and an fx805 camera VTX combo that I had lying around. I made my own connector out of balance plugs but they only have 2 pins (solid pins) which result in less voltage sag. I have included a picture of the size difference between a ph2.0 connector and mine. Since 3d printing has its limitations printing columns that are hollow is very difficult, the Beecore needs to be mounted with double-sided sticky tape on the square bit in the middle of the frame and the camera screwed down on top of that. I am using a 600 mAh battery with my custom plug mod to get around 3:30 - 4:00 min of flight time with plenty of power. I'm thinking of making a mount adapter for tiny whoop batteries (250 mah) and putting 2 of them in parallel, so let me know if you would like that!

OLD Parts:
Beecore V2.0: https://tinyurl.com/rvy9lbq
FX805 Camera/VTX: https://tinyurl.com/vjxmsce
Props: https://tinyurl.com/u7ptb9f
8.5mm Motors: https://tinyurl.com/sgrpe6a
Battery Connector Plugs: https://tinyurl.com/yuhhj469
Battery: https://tinyurl.com/vtwbokb

12/21/2021:
Redesigned to fit 65mm props and upgraded to a Beebrain V2.

NEW Parts:
BeeBrain V2: https://tinyurl.com/2p8zjb37
Props: https://tinyurl.com/3nuec3nb
8.5mm Motors: https://tinyurl.com/2p8mf44e
Battery Connector Plugs: https://tinyurl.com/yuhhj469
Battery: 40c minimum

Prusa MK3s MMU2s

Doesn't Matter

No

.2

anything above 25%