The WP 120 2.5mm is the 1S 3 inch specialist. For these builds I've gone up from 2mm up to 2.5mm thickness to get a little more torsional rigidity. This small change helps reduce noise getting to the gyro allowing less filtering and associated latency. The 120 has a slightly smaller footprint than the 124 as the 1S builds are best suited for smaller backyard spaces. 

Version 4.1 slightly increases the strength at the middle of the motor mount.

Frame: 120 mm MTM, 2.5 mm thick

FC: 16 x 16 stack, 25.5 x 25.5 AIO square orienation, 25.5 x 25.5 AIO whoop orientation

Motor: 2 mm on 9 mm diameter

Props: 3 inch

Canopy: Zip-tie Canopy or the new Printed canopy.(see the canopy tab for the file https://ko-fi.com/quad66/shop)

Weight (aproximate): 5.3 gm