Good news - we're open for limited services in Wembley. Ujima House is now actively under refurbishment and we'd love your help in making the space the best it can be.

Please pay attention to the main LHS mailing list or pop into our #london-hack-space IRC channel and say hello.

During this interim period donations and continued membership are greatly appreciated while we transition to our new space.

Project:25-hpamakers-reprap

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Aim

Finish construction of the printer ASAP and get it running reliably!

How?

Current Development Milestones

1-Construction

Prusa Construction Guide

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

1 x Endstop Holder

2 x Pulley

4 x PLA Bushings

Parent folder for the Prusa STL Files

Parts Printed

4 x PLA Bushings printed at 19:07 on Wed 11th May 2011 by Kal 1.5 x Endstop holder printed at 19:07 on Wed 11th May 2011 by Kal 1 x Endstop holder printed on Fri 13th may 2011 by Glen

2-Electronics

(Sam) Makerbot to Reprap PCB Adaptations.

3-Firmware

(Sam)RepRap Motherboard v1.2 firmware installation.

Notes:


4-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.

5-Commissioning

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

Who?

samthetechie

Kal

alias

lhopki01

dsikar

What?

3D Printer

Prusa Mendel

Sam: I am constructing the printer using this really great guide: 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

We are using gen3 MakerBot Electronics which have been adapted for use with Reprap using this guide

USB to TTL Adapter

Based on the FTDI FT232R.

Mendelusb2ttlconnector.jpg 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#

Sanguinousb2ttl.jpg Fig. 2

From the datasheet:

Um232r.jpg 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.

Motherboard

Reprap Motherboard v1.2

Stepper Motors + Driver Circuits

3 x Stepper Motor Driver v2.3 r1 boards

5 x Nema 17 Stepper Motors

Where?

Why?

Google Docs

Google Doc

Where?

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

Why?

Because we want a 3D printer!