The blower is RYOBI ONE+ R18TB-0, and it's about 60 euros here in Europe. The blower has very good air flow but to get most use out of it, you really need some adaptors for it. This adaptor fits our camping mattresses and I'm sure all paintball bunkers available commercially, at least the ones I tried. I have not yet tried it on swimming toys, since my kids forgot all of them to a cabin they were visiting last week. I think the outer diameter (of the smaller tube) is 17.5 mm.

The best part of this adaptor is, that it actually fits the blower totally perfectly, unlike the hose part that came with it, which is very hard to put on and off.

Print instructions

It takes 9.6 meters of filament when printed with skirt.
Printing time is under 3 hours with print speed of 60 mm/s.

No infill needed, just use 4-5 walls to get rigid part.