Supports: Yes Resolution: 0.05mm layers for nylon, 0.1 or 0.2mm layers for other materials Infill: 40% Notes: Always use a brim. Use at least 1.6mm shells and at least 1.6mm top and bottom layers. Printing has been successful with SLS in nylon and with FDM in nylon, ABS, PETG, Cheetah and Armadillo filaments. Print the palm on its side with support when using FDM. The thumb also needs support during printing. Successful durability of a print can be demonstrated by repeatedly tossing the device in the air to land on a hard floor. If it doesn’t break, then you probably have good layer adhesion but ABS is vulnerable to finger breaking even with use of acetone vapor bathing to assure good layer adhesion. Also, there are thick cross-sections in the palm, so look for cracks due to warping forces during printing. The necessary friction on the thumb and fingertips is provided by silicone calking material (my favorite is as “Amazing Goop”) or a wrap such as Loctite GO2 Repair Wrap http://www.loctiteproducts.com/p/go2_wrap/overview/Go2-Repair-Wrap.htm. Currently, testing has been done only with the small size left and right Gripper Thumb TD as the stress case. The small size should be functional for users of all sizes. Medium and Large size devices will be added to the STL files after they have been tested. Elastic rings designed for veterinary use are made of latex and should not be used by people who are allergic to latex. https://www.amazon.com/Castrator-Rings-300-Pack-Green/dp/B00S8JVLOO/ref=pd_cp_469_3?_encoding=UTF8&psc=1&refRID=06J4ZTT2NQ3SQASSW385