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mercoledì 30 luglio 2014

Stampanti 3D Rep Rap e Arduino

Rep Rap è il progetto open source per la realizzazione di stampanti 3D, in grado di replicare alcune delle loro parti componenti, da cui la sigla che sta per REPlicating RApid Prototyper.

Uno dei modelli più conosciuti è la Prusa Mendel, elaborata da Josef Prusa.

Per questo, come per altri modelli, Arduino produce alcune delle componenti fisiche ed elettroniche:

RAMPS - La scheda di controllo della stampa, di tipo DIY shield board.

Il software per la gestione della RAMP, che converte le istruzioni in linguaggio macchina in movimenti fisici delle componenti, e che può essere scaricato dal sito.

Prusa Nozzle 0.4 mm (12V o 24V) - L'ugello per l'emissione della plastica fusa.

Prusa i3 Frame - E' il telaio per ospitare le componenti della stampante.

Assembled prusa mendel - Stampante 3D

Una lista completa di tutte le parti necessarie, stampabili e non stampabili dalla macchina, chiamate queste ultime "vitamine", può essere trovata ad esempio a questo link.

Le parti non stampabili includono i 5 motori bipolari, fermagli, aste filettate e lisce per i le guide ed i telai, cinture, cuscinetti, molle, la piastra che ospita l'oggetto stampato, ed il dispositivo noto come Wade's geared extruder, che alimenta e scioglie il filo di plastica. Alcune sue parti sono in aggiunta stampabili.

Le parti stampabili includono il carrello per l'ugello, bracci corti e montature, morsetti  e supporti.

Il linguaggio macchina per comandare la stampante è il G-code.

Programmi come 3D e CAD producono file nel formato STL (STereoLithography), da cui si possono generare i file eseguibile in G-code, tramite  software denominati computer-aided manufacturing (CAM), tra i quali i più noti sono slic3r, pronterface, Cura, repetier host.

Le barre servono per costruire tre bracci orientati secondo gli assi cartesiani x,y,z. Gli assi vengono ruotati in modo da posizionare l'uscita del filamento dell'extruder nella posizione in cui deve essere depositato il filamento sciolto, soprattutto muovendo la piastra che ospita l'oggetto da costruire nel piano xy, con movimenti orizzontali x e verticali z dell'extruder..


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