User:Scottlawsonbc

From RepRap
Revision as of 15:17, 4 August 2014 by Scottlawsonbc (talk | contribs)
Jump to: navigation, search


Lawson Documentation
Crystal Clear action run.png
Lawson

Release status: concept

Lawson-early-concept.JPG
Description
Lawson is a printer designed for high reliability and mechanical stiffness.
License
Author
Contributors
Based-on
Categories
CAD Models
External Link


Introduction

The Lawson is a 3D printer by Engineering Physics student Scott Lawson. The Lawson is designed to have high mechanical stiffness, accuracy and reliability. To appeal to a wider audience, there are a number of component substitutions targeted for higher accuracy and precision, or lower component costs.


Design Goals

  • High mechanical stiffness
  • Off the shelf metal versions of all printable components
  • Easy to assemble
  • Fewest number of different suppliers (2 for hardware, 1 for electronics)


Specifications

' λ Variant ϵ Variant
Plastic Parts (exc. Extruder) 0 29
Non Printed Parts approx. All 293
Hardware Cost (exc. motors + electronics) $300-1000? $300-$800?
Controller Electronics Almost all RepRap Almost all RepRap
Printing Size 210 x 210 x 240 210 x 210 x 240
Motors 4 x NEMA 17 Stepper, 1 x NEMA 23 5 x NEMA 17 Stepper
Pro High accuracy, speed, stiffness Lower cost, high speed
Con Higher cost Lower mechanical stiffness and accuracy

Main improvements

The following is a list of the main improvements made upon the Prusa Mendel Iteration 2

  • Enhanced frame rigidity (prevents x backlash)
  • Easy assembly
  • Parametric files for multiple sizes/bearings or bushings

Development

History

Printed Parts

The STL files to make the printer can be found at Clone_wars:_Prusa_iteración_3. and here zipped up: File:Clonewars.zip Please note that the zipped files are not compatible with holes for the Z axis brackets in the Prusa3ALU-*.dxf drawings, at least the ones in the old/ folder in github. Also, the models for Y-axis brackets are for M8 rods. Compiling your own and investigating the Prusa github packages is highly recommended!


RP every .scad in this directory (except complete-printer) once. Aim for 0.3mm layers and 2.2 extrusion width (width over thickness), for 0.66mm stroke width. Printer is tested at this setting.

Using doc/complete-printer.scad as a visual clue and doc/manual.txt as a guide, build the printer.

Frame type


Single Sheet Frame

This is a frame created from a single sheet of metal, typically Aluminum, but can also be made from various Materials with a thickness greater than 6mm / 0.25 inch

Prusa i3 with a single metal sheet style frame.
Prusa i3 with a single metal sheet style frame.


pro:

- Looks professional (subjective)

con:

- Requires specialised tools (e.g. Water flow jet cutter)

- Less rigid connection between XZ-frame and Y-frame part, however this can be somewhat rectified by the TwelvePro variant, which provides additional frame support.



Wood Sheet frame

Wood Style Sheet Frame
Wood Style Sheet Frame
Wood Style Sheet Frame Made Out Of Melamime
Wood Style Sheet Frame Made Out Of Melamime

This is a version of the sheet frame that is designed to be laser cut out of wood or plastic (eg. acrylic) if you don't have access to a waterjet cutter. The only difference is that this version has support gussets on the back side of the vertical frame (the side that doesn't have the z threaded rods).

Construction is the same.

pro:

- Looks professional (subjective)

con:

- Requires specialized tools (e.g.laser cutter)

- Less rigid connection between XZ-frame and Y-frame part (Connects in the same way as the alu sheet frame)



Electronics

Stepper Motors

Controller Electronics