If you have day/night roller blinds in your house like me it's very likely that you are missing caps for weights in those blinds.

Attached print profile contains 8mm cap but model is parametric so feel free to generate your own! 

Parameters:
- outer diameter (without tolerance!)
- diameter tolerance (default one is push-fit tolerance)
- length (length of the tube without flange)
- flange offset ( how much bigger is the flange compared to tube, 12mm offset and 8mm diameter results in 20mm flange)