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Lawson Documentation
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Release status: concept

Lawson is a printer designed to have high accuracy, precision, and mechanical stiffness.
CAD Models
External Link


Lawson is a high precision and mechanically stiff 3D printer. Components can be substituted to tailor the printer for higher accuracy and precision, or to lower build costs.


  • Stiff, rigid frame with no play
  • High accuracy and precision
  • Mechanical components can be purchased from two suppliers, minimizing the reliance on a middleman supplier.
  • Components can be substituted to achieve higher quality or lower build costs, appealing to a wide audience.


Component λ Variant ϵ Variant
Mechanical parts (exc. motors, electronics, screws) 26 26
Printed parts (exc. motors, electronics, screws) 0 17
Hardware Cost (exc. motors, electronics, screws) $443.41 $369.52
Controller Electronics Almost all RepRap Almost all RepRap
Printing Size 200 x 200 x 240 200 x 200 x 240
Motors 4x NEMA-17 Stepper, 1x NEMA-23 5x NEMA-17 Stepper
Pro High accuracy, speed, stiffness Lower cost, high speed
Con Higher cost Lower mechanical stiffness and accuracy


Design Goals


Component Sourcing



Overview of the triangular y-axis belt drive mechanism.

The y-axis is a belt driven linear stage powered by a NEMA23 stepper motor.


Printed Parts

A number of Lawson components can be 3D printed instead of purchased. However, unlike other 3D printers such as the Prusa i3 and MendelMax, all printed components in the Lawson have off-the-shelf purchasable substitutes. This was done for two reasons. The first reason is that you can obtain higher mechanical stiffness by using metal components instead of printed components, although printed components are still effective. The second reason is that having a purchasable version of each part makes the design more accessible, minimizing the reliance on outside suppliers.

High precision design

The lead screws and linear rail are some of the Lawson's most expensive components. While cheaper components are available, the lead screws are critical to ensuring high accuracy, and the linear rail is key to making the print bed mechanically stiff. Other designs, such as the Prusa i3 or MendelMax 2.0, do not have the same mechanical stiffness that the Lawson printer has.


Almost all RepRap electronics such can be used to control the Lawson. Electronics confirmed to be working include the RUBMA Board, Printrboard, GEN7, RAMPS, and Rambo board.