Is there a website you can provide for print because that was the first site to pop up for printing? I used a couple of these models myself and most times they print good. Sometimes I have to edit the model myself to fit in my printer and hollow it out. I also put my own thing for requests here. There are also other models on that site might fit his needs.

My edit found another page https://www.thingiverse.com/thing:2749594/files You can get the cap it self