This was more of an experiment and as expected the suction power of the vacuum is not really as good as the hand-pump.
It does work though, although slower, if you prepare/open the valves with the handheld vacuum pump first and finish with the same.
Best printed in hard TPU with 100% infill and inner-brim and large layer-height.
Put the opening that will face the vacuum bag flat on the printbed, to make it flat and improve the vacuum seal.
The author marked this model as their own original creation.