User:Scottlawsonbc
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Release status: concept
Description | Lawson is a printer designed for high reliability and mechanical stiffness.
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Contents
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
' | Single Sheet Frame | Box Frame |
Plastic Parts (exc. Extruder) | 26 | 29 |
Non Printed Parts approx. | 337 | 293 |
Cost | $300-1000? | $300-$800? |
Controller Electronics | Almost all RepRap | Almost all RepRap |
Printing Size | 200 x 200 x 200 | 200 x 200 x 270 |
Motors | 5 x NEMA 17 Stepper | 5 x NEMA 17 Stepper |
Frame Material | 6mm Aluminium, Wood | 12mm Wood |
Frame Manufacture | Laser Cutter, CNC, Water Jet | Basic Woodwork Tools |
Pro | Easy assembly | Rigid XZ to Y Connection |
Con | Specialised Tools | Looks less professional? |
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
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
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)