I needed an all-plastic scraper for removing parts from my printbed, and for scraping/brushing plastic bits away after printing without risking damaging the bed surface, and found Andycap's "universal scraper". After a short while mine got too dull to use, then had an unfortunate meeting with some acetone, so I decided to remix it, separating-out the scraping edge of the tool and turning it into a replaceable "blade" piece similar to a typical utility blade.
This way, I won't need to re-print the whole tool when the edge gets too dull to use.
The blade is to be secured with two roughly 3.5 x 6 mm screws, with threads appropriate for biting into plastic. 9/64" or M3.5 machine screws will probably work too, as will SAE #6-32's. A pair of M3's might work in a pinch, depending on how well your printer is calibrated. The back edge of the blade fits under a lip, which takes up most of the force from scraping, so the screws only need to be snug enough to hold the blade in, they need not be in super-tight. Note that this does NOT accept actual metal utility blades.
I also took the time to try to clean up the faceting a little (just to make it easier to edit), and I've rotated the models to the right orientation for printing.
Being that the blade is kinda thin, you probably don't want to use this remix to go scraping ice from your windshield. :-) It's intended for light-duty uses where a metal blade is not acceptable.
Print the handle at around 30% triangle infill. Blades should be 100% solid rectilinear. In the photo, I used Atomic Starry Night v1 PLA for the handle, and Atomic Silver Metallic v2 for the blade. The camera definitely did not do the prints justice; they look far better in reality. The blade is actually printed upside-down; flip it over to mount it onto the handle.