- 1 Coil flint from a BIC or Mini-BIC lighter; - 4 Shims w/ inner diameter > 5 mm (I used rolls from a used bicycle chain; - 1 screw M3 5 mm length OR - MK8 ================================= - PTFE liner 40 cm; - 2 608 bearings; - 2 screws M3 20 mm length; - 3 M4 nuts to secure the PTFE line (2 for the loop and 1 for the start of the bowden line to the hot-end); - 1 Step motor NEMA 1.7A (or even lower);