Various brackets for building a wooden box

Very simple brackets I used to create a box with 3mm MDF:

• 2 corners 75mm height, width, length. (one without bottom for two sides)
• 1 edge
• 1 flat
  Surfaces are 3mm thick
  Holes are 3mm Diameter
  I printed mine in PLA with infill density at 0.3 and as strong enough to tap screws through without breaking.