Project:25-hpamakers-reprap

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Aim

Get a working 3d printer. Make shit. Be awesome.

How?

Current Development Milestones

1-Construction

PLA Parts Needed (as of 17:18 On Wed 11th May 2011)

3 x Endstop Holder

2 x Pulley

6 x PLA Bushings

Parent folder for the Prusa STL Files

2-Firmware

(Sam)RepRap Motherboard v1.2 firmware installation.

Notes:

3-Testing

(Sam) Check Wiring + Firmware: Desktop-based test of all stepper motors and electronics.

Notes: I am going to be flashing the firmware using an FTDI cable and then I will check our USB to serial cable.

(Kal) Check Mechanical Construction against instructions + Begin Calibrating

Notes: Hey Kal, Sam here, in order to mechanically calibrate the frame I would recommend going through part 5 (page 32) of this visual guide:
http://garyhodgson.com/reprap/prusa-mendel-visual-instructions/
We might need to cut some more steel stock if any of the lengths are too short.

4-Commissioning

Begin printing Make first model Make first part Make first set of parts

Who?

User:samthetechie

dsikar

What?

Delicious Links

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3D Printer

Prusa Mendel

I am also using a great guide that I found here: Prusa Visual Instructions

Mendel Specifications

The table below outlines the specifications of the machine.

	Metric
Model	Reprap II: Mendel "Mendel"
Technology	FFF (Fused Filament Fabrication)/Thermoplastic extrusion
Price of all materials	€350
Annual Service Cost	Occasional oiling = €5. It can print its own replacement printed parts at material cost.
Size	500 mm (W) x 400 mm (D) x 360 mm (H)
Weight	7.0 kg.
Build Envelope	200 mm (W) x 200 mm (D) x 140 mm (H).
Materials	PLA, HDPE, ABS & more. Uses ø 3 mm filament.
Material Cost	PLA: €22/kg, HDPE: €11/kg, ABS: €17/kg.
Speed	15.0 cm3 per hour solid (test done for PLA, similar for others).
Accuracy	Diameter of nozzle 0.5 mm, 2 mm min. feature size, 0.1 mm positioning accuracy, layer thickness 0.3 mm
Finish	Fair
Volume of printed parts to replicate	1110 cm3

(With the standard infill settings the 15.0 cm³ per hour solid extrusion rate is equivalent to a built volume rate of 19.0 cm³ per hour.)

Consumables

Blue Decorator's Tape

PLA, HDPE, ABS Filament

Computing

Netbook with Solidworks and Reprap Host Software.

Power

Converted 300W ATX Power Supply. +12V and GND. 5A current.

Electronics

USB to TTL Adapter

Based on the FTDI FT232R.

Fig. 1

Currently the connector is wired such:

GND DCD# VCC TXD RXD RTS#

While the Sanguino (at least v1.0) expects:

GND GND [USB_5V (VCC)] RXD TXD RTS#

Fig. 2

From the datasheet:

Fig. 3

It can be inferred that the correct terminals on the cable in Fig. 1 should be:

GND GND VCC TXD RXD CTS#

All said, the extruder and main motherboard (gen 3 reprap electronics) have been successfully flashed using this controller so perhaps the critical lines are in, one GND, VCC and TXD plus RXD which afaik handle the data transmission.

Google Docs

Google Doc

Where?

London Hackspace: http://london.hackspace.org.uk/

Why?

Because we want a 3D printer!