I''ve exported the knob and the lower teeth peice together cause my intention was that they will and could be printed with PVA support. the upper teeth can be printed twice (it's the same peice in both sides). the pivots of the upper teeth can and should be made with stainless steel rod, so it could last a long rime. maybe some of the surfaces will need a bit of sanding to fit it nicley to it's place.