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Mused over various more complicated designs then printed this at fine quality with dense infill and no bed adhesion - took about 45 minutes on my Anet A8.
The model turned out really well and it works like a charm - I will be printing more.
If you put the tube on a flat surface the wide edge of the squeezer makes a very effective 'iron' to push the contents away from the crimped end before fitting the tube through the slot.