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Materials and Tools
- Polarity refers to DC power - one of the conductors is positive (+) one is negative (- 'ground' on the controller board). Steps where polarity is a consideration are noted - pay close attention and make sure that the positive and negative conductors are in the correct locations before applying power to the printer! Consequences of failing to observe polarity are expensive.
- There are three motors that control the movement of the printer. The motors are identified as U, V and W. When looking at the front, the extruder drive (with the fourth motor) is at the back of the printer. The U motor is on the left front, the V motor is on the right front and the W motor is in the back center on the apex with the extruder drive.
- The Melzi controller expects a Cartesian robot, where every motor is directly controlling the movement in one of the Cartesian coordinate directions, X, Y, or Z. For this reason, the terminals are labeled with those coordinates. For a delta printer, the U motor connects to the X-terminals, V to the Y-terminals and W to the Z-terminals.
- The bridge board is optional, but recommended. It provides more reliable communication between the Beaglebone and Melzi. The Melzi's USB connection has frequently proven unreliable. If the bridge board is not used, connect the two with a USB cable.
- Loosen all of the screw terminals on the Melzi controller and insert a screwdriver into each terminal to insure that it is fully open. This will greatly ease insertion of wires in a later step.
Controller Power and Jumper Settings
- Set the printer on a chair so that the motor end faces upwards. When looking down at the motors, W, U, and V are in clockwise rotation with W being the motor on the apex having the extruder drive and spool holder mounted to it.
- Wires can be tucked behind the controller board and secured to the standoffs with wire ties to keep things neat. Secured and well bundled wires are less likely to get entangled and pulled out of terminals.
|AthenaII Printed Parts Glossary|
|Assembling hot end|
|Soldering and tinning|
|Track 1||Track 2||Track 3|
|Connecting Rods||Frame||Epoxying Magnets|
|Epoxying Magnets||Connecting Rods||End Effector|
|Extruder Drive and Spool Holder||Epoxying Magnets||Frame|
|End Effector||Extruder Drive and Spool Holder||Connecting Rods|
|Frame||End Effector||Extruder Drive and Spool Holder|
|Final Mechanical Assembly|
|Firmware and Calibration|