This spacer will stand the KST215MG servo off the mount so that they fit the same as the stock Blade H3050 servos. The servo linkage will be 90 degrees to the arm. Also the servo arm will not rub on the frame on the right side of the helicopter.
This version is 2mm thick not including the nubs.
TPU works well but may need a bit of post processing clean-up.
I haven't tried PLA....