250 Quadcopter Multirotor frame for kk2.1 and kk2.0 board

thingiverse

All components can be printed separately using a printer with a build platform measuring 5.5 inches by 5.5 inches or larger. It will take approximately nine hours to complete the print process in total at a layer thickness of 0.2 millimeters. This is a 250 quadcopter frame that I designed based on other 250-sized quads, featuring the KK2.1 board available from HobbyKing for just $20. Although this design might work with various flight controllers, it is specifically tailored around the KK2.1 board. The frame consists of multiple parts to make repair easier in case of a crash. It utilizes M3 screws or bolts to hold everything together, including the KK2.1 board and motors (depending on the motor type). Each arm features labeling to indicate the correct motor orientation and needs to be printed twice, along with each landing gear component. To complete the assembly, you will require M3 screws, nuts, and washers: 20 x M3 nuts, 16 x M3 washers, 16 x M3 bolts measuring 25 millimeters in length, and 4 x M3 bolts measuring 10 millimeters in length. These parts are used to stabilize the motor mounts. Note that washers ensure steadier placement of the screws holding the motors. This quadcopter frame allows ample clearance for any moderately sized battery (such as a 2500 mah 3s) or less to be used effectively within its framework. The unique 'X' shaped motor mount structure provides adequate mounting points for any small motor suited to 250 quads, recommending propellers of five-inch size. In addition, two conveniently placed battery strap holes pass under the kk2.1 board and provide support to hold a battery firmly in place underneath the frame's main components. A disclaimer: although this print hasn't been tested, it has undergone electronic assembly successfully. I have designed several quads myself and can vouch for their stability and durability; flying and building my own 650 multirotor is something I feel quite confident about accomplishing successfully. Therefore, if anyone wants to contribute by being the first to test print this item on a printer at home or with your work, just upload an image here for everyone's benefit – and remember you can possibly only have to touch up parts by sanding afterwards to complete its effectiveness fully.