A quater pipe when u print two and fix them on a plate you will get a halfpipe. its about 18cm (7 inches) high and with the "middle-Frame" you can print it "endless" if you want to.
What you need for 1 Quaterpipe:
PLA or ABS and a printer
Any glue to glue the patrs together .
and 4 screws 2-3mm in diameter, about 8-10mm long
and a Fingerboard :-)
if you double these things you get a Halfpipe