Print every Part and a mirrored version of it. 

print them upright with no support and 5% gyroid infill

the cover on its long side 

main on its big side with added support, where the servos will be.

every wing part on the bigger side

and the winglets on theire flat sides.

there are two holes trough the wing where you have to add carbon fibre tubes. for the winglet get a carbon sttick, which fits the holes, so they can pivot.

Add 2 Servo motors in the mounts. when placin a battery, make sure to balance your monowing correctly.

Dont usa a huge propelle

Glue the pieces together and for the main part and the cap, use a hand full of prited pins and the bridge for a solid connection. the cap and the main part have to be fitted with magnets to holt it in place.