There are many scraper models here, but I prefer these cheap plastic razor blades. If you buy them there is often a simple scraper included, which works pretty well.

This is just a holder to keep it in place at a Skadis peg board.

Best printed as oriented in the stl file. Take care of good bed adhesion. If you have problems use a brim.

No support needed.

As stability junkie I used 4 walls.

I also made a model for the wall.

The holder is quite flat, so I recommend using the Skadis Lock Plug (5mm) to prevent the holder from sliding out of the pegboard holes.