I made this scraper since I did not want to use a metal scraper and also because all other scrapers I found used questionable licenses
 

For printing I recommend a layer hight of no more than 0.4mm, personally I set it for me to 0.3mm. No support needed
 

Edit:

The normal version of this simple scraper has 3mm thick walls on the outside, the thicker version has 5mm thick walls, in case you need additional strength