4 ms·In what way do you consider STEP to be a mess?by rjsw 5y agoIn what way do you consider STEP to be a mess?engr 5y agoISO 10303-21 is annoying to read and write, with an awful lot of stuff not used by CAD toolsrjsw 5y agoDon't read or write it then, use software that will do it for you. I don't know of anything that isn't useful in ISO 10303-21.