Dry bag adapter for Zwilling vacuum pump

Apart from kitchen usage Zwilling Fresh & Save pump is quite handy also for creating vacuum in filament dry bags. Zwilling has in fact at least one bag type that would in principle have space for even two (narrow) spools, but their bags appear to be clearly more expensive compared to the ones commonly for sale. Also, I don’t want to press with the pump’s own silicone lip directly when working with dry bags, but think it's better to let the flat surface inside to bear all loads and do sealing at pump's end.

I therefore designed a simple adapter simulating the typical hand pump’s head (approx.  24 mm in diameter) that is placed on top of a normal dry bag's vacuum valve. Adapter’s diameter where it goes inside Zwilling is 31 mm.

Material should be TPU or similar soft stuff. I used 95A.

Your normal settings for printing TPU apply here (slow speed etc.) The adapter shown in photo has 3 bottom and top layers (concentric pattern), 3 wall loops and 12% rectilinear type infill. Seams are set random in order not to create any continuous ridges anywhere. Material consumption is ~ 10 g.

EDIT 1: My printer had a 0.6 mm nozzle so layer height was 0.3 mm. Please take this into consideration, if needed.

I printed the adapter so that the sealing surface against dry bag was facing to build plate. There is however a recess in the adapter head that will need support in that orientation. I used tree type support, but I think any other type will do also since TPU supports are quite easy to remove. If you choose to lay the adapter other way round, make sure that the bag sealing surface will be smooth enough after print.