In 1899, Ahrens met Elbert Hubbard, the founder of the famous Roycroft artist community in East Aurora, New York. Hubbard admired Ahrens' art, and when he learned Ahrens also had experience making pottery, he asked Ahrens to join the Roycrofters and open a potter shop there. In May of 1900 Ahrens moved to East Aurora with his wife, three children (Carl, Robert and Pauline) and his cousin, fellow painter Eleanor Douglass. Hubbard, a businessman, and Ahrens, a craftsman, soon butted heads over what constituted a finished piece. Hubbard, impatient, insisted the pottery be sold unglazed and, thus, unable to hold water. People willingly bought any item bearing the Roycroft mark, but the pottery was of little value. No surviving pieces have been found.
Ahrens left the Roycroft community after only four months but remained in East Aurora for several more years. While the potter shop was considered a failure, the experience proved pivotal to Ahrens' life. It was at Roycroft that he met and fell in love with Martha Niles, a young artist and singer who illuminated books for the print shop. According to letters written by Ahrens, his marriage to Emily Carroll had been unhappy from the start. Ahrens set off for New York City alone in 1905, soon reuniting with Martha, whom he nicknamed Madonna.