Use a printer that is able to print the size or scale it down. The final Grail is just a tad taller than 20cm in height (at least my printer showed that).

Don't use too much infill or it will take ages. I ran with 5% or 10%, IIRC. Tuned the settings for speed, so I got finished on a single day (a bit over 7 hours, actually). I also chose a rather high speed for my printer and a layer height on the bigger end of the scale.

If you set everything for quality and a high infill value it will easily take multiple days.

Hardest parts are the bottom of the letters and the spike. Either use supports (I didn't -> speed) or do whatever else you got to do to print things nearly horizontally. Clearing the model up afterwards does work, too - spikes on the bottom did come off easy on my print. So handle those with care.