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Printing will do far better detail work, but will need painting. Could be glued on with CA or hot glue, if the PCB placement. Alternately, pot shafts could be done externally with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, 12mm CR1220 battery holder, Keystone P/N 2462, https://www.keyelco.com/product-pdf.cfm?p=1027 1xAAA Battery Holder, 2479, Battery Type 3xAAA Keystone Battery Holder BH-331P Battery Type 3xAAA Keystone Battery Holder, 2479, Battery Type 3xAA Battery Holder BA9VPC 9V 2xAA cell battery CR-1025 coin cell battery holder, Keystone P/N 2462.