LOL, I've been designing the same cloverleaf caps.
Shapeways is not cheap so I used them to print a master parts, from which I then casted resin copies.
Investing in your own 3d printer is worth it. My 3d material cost is a fraction of what Shapeways would charge me to print these cloverleaf caps. Ofcourse you need to invest money , but I have recuped that at least 10 fold sofar.
It's just like printing money...
