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.
During this interim period donations and continued membership are greatly appreciated while we transition to our new space.
- 1 Aim
- 2 How?
- 3 Who?
- 4 What?
- 5 Mendel Specifications
- 6 Electronics
- 7 Where?
- 8 Why?
- 9 Google Docs
- 10 Where?
- 11 Why?
Finish construction of the printer ASAP and get it running reliably!
Current Development Milestones
PLA Parts Needed (as of 17:18 On Wed 11th May 2011)
1 x Endstop Holder
2 x Pulley
4 x PLA Bushings
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
(Sam) Makerbot to Reprap PCB Adaptations.
(Sam)RepRap Motherboard v1.2 firmware installation.
(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.
Begin printing Make first model Make first part Make first set of parts
Sam: I am constructing the printer using this really great guide: Prusa Visual Instructions
The table below outlines the specifications of the machine.
|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)|
|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|
|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.)
Blue Decorator's Tape
PLA, HDPE, ABS Filament
Netbook with Solidworks and Reprap Host Software.
Converted 300W ATX Power Supply. +12V and GND. 5A current.
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.
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#
From the datasheet:
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.
Reprap Motherboard v1.2
Stepper Motors + Driver Circuits
3 x Stepper Motor Driver v2.3 r1 boards
London Hackspace: http://london.hackspace.org.uk/
Because we want a 3D printer!