sets of two different rotorblades. nose hole is for both for a 2,5mm rod.
the epp333 set is designed for a 7mm round spar.
all but the root is printed with 100% infill.
infill for the root has to be designed in the slicer with several processes. 100% around the hole for the mounting bolt. then decreasingly less down to 10-20% where it joins the main blade.
epp333 V2 has a 3mm nose hole makes a better fit for 2,5mm rod
root epp333 ribs v5 has the ribs extending thru to the root, to be printed in one process with 100% infill.