The file 'Replacement Flipper For Extension Ladder 3D Printer Model' is (scad,stl) file type, size is 19.3KB.
Extension ladders have aluminum rung locks so you can raise and lower simply by pulling a rope, and safely locking in place when the right height is reached. When lowering the extension, a pair of spring-loaded plastic "flippers" push the rung locks out of the way.
I recently acquired an old 32' extension ladder with a broken flipper and rather than buy a replacement kit, designed a flipper in OpenScad and printed a pair on my Printrbot simple. It works very well.
Installing these can be tricky, but there are youtube videos like this: https://www.youtube.com/watch?v=-9dIPjSjOlw .
I printed mine at 20% density with an extra-wide brim for adhesion since I don't have a heated bed. Good luck!
ladder_flipper.scad | 1.2KB | |
ladder_flipper.stl | 235.6KB |