ORTLIEB BACK-ROLLER URBAN Frame

I have designed a rack with which the Ortlieb Back-Roller Urban bag stands on its own. This is especially great when you have this fully loaded, for example, from shopping. 
Best you print this in PETG. To attach you loosen the three screws at the bottom of the bag. Then you put the screwed together frame into the bag. Then simply insert the three screws from the outside and tighten them. Done. 

Screw:

7x M4.0x16 Self-tapping or similar

Have fun with it.