Fig. 2.

Assembly of module 1

(a) coil springs (Prusa Research a.s., Czech Republic) enable forward and backward movements (see arrows) of the gear housing to compensate for production-related deviations of the filament diameter.

(b) filament supply via pfte tube (Prusa Research a.s., Czech Republic) and push-fit crew connection QSM-M5-4 (Festo Vertrieb GmbH & Co. KG, Germany)

(c) worm gear motor

(d) view from above on motor housing

(e) view from below on motor housinge

(f) 8 square nuts M3nS (Prusa Research a.s., Czech Republic) were inserted in the motor housing (see arrows). The square nuts served the stable fastening with module 2.

(g) filament spool holders mounted in motor housing.