This is a simple plate scraper I designed that uses a sliding feature in order to make the blades easily replaceable without needing to reprint an entirely new scraper. I have included two slight variations of the blade, the perfect blade (on the build plate) offers very low wiggle between the two parts and is relatively easy to slide. The easy slide blade (outside the build plate) has a lot more wiggle between the parts and is very easy to slide.

An important note is that the blades may be initially very difficult to slide apart, which is correct. The sliding feature uses friction and a small offset between the parts in order to work which leads to heavy resistance when first trying to slide the parts, but gradually less and less resistance as the parts slide more. I recommend removing any extra or lose material between the two parts before attempting to slide them. 

The method I used to slide the parts initially was to remove any excess or loose material (due to the supports) and then completely slide the blade and handle together until they are flush. 

After which I would recommend wearing a glove and then trying to unslide the parts 1-2 times to make sure they are more loose without scraping your thumb like I did. If you have difficulty sliding the parts together or apart I recommend using a table for support and pushing down on the top of the handle (next to the blade) in order to make it easier or deal with extra resistance.

That's all, I hope the print turns out well and is useful to you.