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Release status: experimental

Wallace is a parametric version of the Printrbot design.
CAD Models
External Link


The RepRap Wallace is named after Alfred Russel Wallace, who independently discovered the theory of evolution by natural selection after Darwin, but before he published. It is loosely based on the Printrbot, but is a complete redesign in OpenSCAD to be more robust (without the loose press-fit mountings), but still extremely simple. It is designed for use with 6mm smooth/threaded rods and NEMA14 motors like the ones used in the Huxley design, and LM6UU bearings for linear motion, though its parametric nature means that NEMA17/M8/LM8UU versions will also be possible. Depending on the rod sizes, Wallace can be configured with a full size 200x200x140mm build volume, or larger or smaller as desired. STLs can be found on thingverse, the source is on Github, and the latest updates/previews can be found on Whosawhatsis' Google+ page. This design is a work in progress. Whosawhatsis discussed V2 at https://plus.google.com/u/0/105535247347788377245/posts/SRZpmqRG2on .

Not to be confused with the Wally RepRap.


  • Printed Parts: 26
  • Non-Printed Parts: ~125+ (4 steppers, 7 threaded rods , 6 smooth rods, 11 LM6UUs, 6 323s, 2 belts, + ~89 misc. hardware, +extruder, +electronics)
  • Material Cost: ~200 ($50 printed, 60 steppers, 30 rods, 20 bearings, 10 belts, 30 misc.)
  • Cost: ???
  • Printing Size: 200mm x 200mm x 140mm (8"x8"x5.5")
  • Precision: X,Y,Z=0.07,0.07, 0.025mm (with 4,4,2 microstepping)
  • Speed: ??? (position/printing)

The initial build guide is the Wallace Build Manual.

--MrJohn 01:25, 3 February 2012 (UTC)

Video showing Printf.bot first print on 2011.12.31, driven by R2C2 (recorded on 2011.12.31 by Casainho):

Video recorded on 2011.12.17 by Whosawhatsis:



In addition to the printed parts, the following parts are required (this is a tentative list, and the parts WILL change before the design is complete):

  • 2 high-torque (~20 ozf-in) NEMA14 stepper motors. Sources:
  • 2 low-torque or high-torque NEMA14 stepper motors for the Z-axis.
  • 1 set of electronics
  • 1 extruder
  • 3 pairs of 6mm smooth rods (measurements will depend on desired build volume. 350 mm X 320mm X 350mm gives about 200 x 200 x 170mm).
  • 3.5 pairs of M6 threaded rods (measurements will depend on desired build volume, 1 pair between bases, 1 pair as z-leadscrews, 1 pair as feet, and 1 more bar between z-top-clamps).
  • 16 M6 nuts -- (8 for threaded X-rod, 2 for Z leadscrews, 4 for Z_top_clamp, 4 for Y-Idler)
    • These can be found locally.
  • 2 M6 nylock nuts -- (for the leadscrew couplers. You may substitute 2 regular M6 nuts tightened against each other to lock them in place.)
    • These can be found locally.
  • 12 M6 washers. (8 for threaded X-rod, 4 for threaded Z-top rod)
    • These can be found locally.
  • 11 LM6UU linear bearings. (4 Y-bars/Base, 4 Z-bars/X-ends, 3 X-bars/X-carriage)
  • 3 623 bearings. (6 needed for the double-bearing idlers)
  • 17 10mm M3 screws -- (8 base motor + Y-bearing clamps, 4 Z-sockets, 2 drive pulleys, 2 Z-connectors, 1 X-belt clamp)
    • These can be found locally.
  • 7 30mm M3 screw -- (2 Y-idlers, 2 Y-belt mounts, 3 X-motor mount? (x motor mount may bottom out at ~15mm))
    • These can be found locally.
  • 2 50mm M3 -- (X idlers + x-bar/z-bearing clamps)
    • These can be found locally.
  • Approximately 13 M3 nuts and washers.
    • These can be found locally.
  • 1 sheet of MDF or other flat material (measurements will depend on desired build volume).
    • You can buy this locally and cut to size.
  • 2 belts
    • This could be of type "XL timing belt" like here. Or type "MXL timing belt" like here. It should match your drive pulleys from below.

Printed parts

Printed parts on a 150x190x70 plate -- All printed parts arranged 150x190x70mm.
200mm plate display medium.jpg -- An STL for all printed parts on 3/4 of a single 200x200x70mm plate. STLs are also available as three 100x100mm plates on the thingiverse page