Printed at 150% (after much experimentation) looks about right for 28mm - as seen with this Warlord Games Zulu Wars British infantryman. Took just over an hour on my printer, using the settings I use for small supported figure parts. Supports came off reasonably easily. 100% might work for 15mm or 1/72. At 200% the carriage was about the size of the larger ones in period photos but the specs on Wikipedia and other photos supported the scale I printed at. Printed with brims all at the same time but probably only the hopper really needs it. Also printed a couple of extra hoppers to give crewmen something to do.