I must unfortunately add my concerns about the Juicer to the growing list of those not getting any Horseshoes from that particular building. I can only hope that I will be able to convert enough of the other horseshoes upward to get enough Rainbow Horseshoes to complete the goals. I hate to rely on the lower levels because the crafting times are so long...but with the Apple Trees taking 8 hours, and the Mine being a game of chance, I really have no choice but to do what I can. Now, after reading DaphneGlass' post (#235), I wish I had held off on getting the Rainbow Stable until after I had gotten the horseshoes from the Juicer.
Oh, well.
EDIT: no sooner did I post than I collected from my Juicer and received a horseshoe. Lady Luck and Lord Chance are fickle indeed. Still, I probably won't get anymore from the Juicer for at least a day, so I'm still going to need to rely on the other horseshoes to craft upward...hopefully my luck there remains positive.