Professional printing services are usually expensive, might be better to buy a second hand printer if you already plan to get one. Don’t know the market in Japan but I guess they will charge you more than much more than 50€ and you can get a second hand printer which originally cost 400€ for maybe 150-200€.

Unlike a 1000€ printer, you will have a learning curve but you can get as good looking print as a 1000€ printer. Main difference is plug and play (yet still have to learn slicer settings and how each settings interact with each others) and printing speed.

Also, while you may choose from printing services what material to use, I ain’t sure you can tell them what settings to use. As they are a printing services, you shall only tell them what those stl are used for and they should adapt according to their knowledge because they are much more than filling to take into account like walls, infill type, layer thickness, printing speed, print orientation…

Pla should be fine except maybe for the part that goes around the cylinder (depending force that is applied to it and thickness of part). In this case, petg or abs might be better

Instead of printing services, another possibility is to check the different fab lab in Tokyo, contact them and see what they offer.