35mm Spool Holder For 3DQF Filament rolls

Hi,

Please find attached my spool holder design for the UK based company 3DQF's filament rolls. (https://www.3dqf.co.uk)

this is for their newer 35mm holed cardboard and metal spools.
I have made 2 versions:

1: For a standard 8mm threaded rod
2: For a 19mm rod. Like ones that tend to be used in DIY filament storage boxes.

the end cap will fit both versions 19mm/8mm.

I have also included the test thread piece I slice off the top to allow you to test your printers tolerance with t