3D printed lower&upper frame for Rostock Mini

If you want to build a rostock mini this part could be useful for you. It serves to 3D print the upper and lower frame. In the original design this pieces must be laser cutted. But I don't like this and finally design a piece that could be 3D printed in a standard hotbed of 20x20cm to accomplish this function. With this design the upper an lower frame will be identical.

The piece needs 2 hours to be printed. You will need 3 copies to build every frame. It has 4 holes in one corner to attach