I seem to run into this a lot so there must be a simple solution, I have this simple code and it just says Command: fz Unknown command "FILLET". Sorry for the stupid question Thanks Dave (defun c:fz () (setq old_filletrad (getvar "filletrad")) (setvar "filletrad" 0.0) (command "fillet" pause pause) (setvar "filletrad" old_filletrad) (princ) )