[2] After finishing a guest stay at the Odenwaldschule due to a scheduling dispute with its head Paul Geheeb, Lämmel founded the Landerziehungsheim Schillerheim in 1917, which also failed economically.
Thanks to his educational publications, he was appointed as a Studienrat in the Thuringia Ministry of Culture from September 1923, but was placed on probation in July of the following year due to the economic crisis, together with a drastic reduction of his salary.
Lämmel has since been active as a popular science writer and children's book author and published his programmatic work on modern dance in 1928, in which he vigorously opposed the prudery caused by the tradition of mind-body dualism of Christianity, and demanded the admission of nudity in dance and gymnastics especially in pedagogy, from which he expected a liberating effect on personality development.
[3] Lämmel was an early popularizer of Albert Einstein's theory of relativity, publishing newspaper articles starting in 1911 and one book in 1921,[L 1][L 2] and was a contributor to the documentary movie Die Grundlagen der Einsteinschen Relativitäts-Theorie in 1922.
[4] In 1933, Lämmel was retired due to his proximity to social democracy under the Law for the Restoration of the Professional Civil Service and returned to Zurich, where he lived with his large family under difficult economic conditions until he was hired as a teacher at the Juventus school and later at the associated evening school, where he taught physics until his 80s.