More T-Rex Details

You Can Print BIG and With Multiple Materials

We want to enable you to 3D print things you have never been able to print before, so imagination can soar and you can create. Our goal is to enable you to print large, complex objects in multiple materials with precision and enough speed to be practical.

Quick Specs T-Rex Summary
Entire Family of 3D T-Rex Printers
Architecture Folding Gantry style 3D printer
# Extruders Each printer can house up to 4 independent extruders
Body Aluminum U-Chanel, custom machined connector blocks
Best Print Layer Resolution 40 micron
Top Print Speed 110 mm/s
Heated Bed Yes. Includes independently controllable zones.
Extruder Cooling System Liquid Cooling
Bed Leveling Auto Leveling
Build Volume of T-Rex 3D Printers
  T-Rex-12 T-Rex-18 T-Rex-24
Inches 12" x 12" x 12" 18" x 18" x 18" 24" x 24" x 24"
Cubic Inches 1,728 cu in 5,838 cu in 13,824 cu in
Cubic Feet 1 cu ft 3.375 cu ft 8 cu ft

3DMonstr T-Rex Is A Monster of a Machine in So Many Ways

This is the 3D printer that Tim "The Tool Man" Taylor  (from the TV show Home improvement) would use.

Our T-Rex printers are not for the faint of heart. They are for people who want to push the limits -- the boundaries -- of what can be printed with 3D printing at home or at work.  We believe that the next revolution in 3D printing will be the materials that people who own 3D printer can print with.

That's why we focused on building a quad-extruder 3D printer that is rigid and sturdy enough to handle speed, heat, and size, and why we built quick mounts for each of the four extruders.

Currently, we can print PLA, ABS, HIPS, PVA, Nylon, PET, NinjaFlex, and Paraffin Wax. And now that we have a strong, powerful foundational structure, our future plans include continuing to build our line of extrudinary (OK, we had to get that in at least once!) extruders, expanding the practical applications of 3D printers, and allowing you to print the full range of plastics, soft pastes, and food products.

Printing soft pastes like paraffin wax, clay and silicon rubber, allows the creation of comfortable shoes and plugs for lost paraffin wax casting.

With 3DMonstr, 3D Printing Makes Sense

We have extended the range of things you can print in size, and it is our mission to continue to innovate in that direction and expand the range of applications for 3D printing.



How The 3DMonstr T-Rex Printers Have Been Designed and Built

All 3DMonstr printers come in two parts -- the gantry is separated from the table bed for easy transport -- and can be put together within minutes. (The only tools needed are as set of metric Allen wrenches.) Each machine will be fully tested before being sent to its new owner.

3DMonstr printers' gantry frame is built from high strength aluminum U-channel extrusions and custom connecting blocks machined to exacting tolerances from 25mm (.98 inch) billets of aircraft grade aluminum. Early in the design process, we ran simulation analyses for a bare frame with only guide rails.  It provided excellent aligning and guiding, and the structure kept its rigidity.  We considered adding a frame, but we wanted the design to scale easily and fold for storage and transport.  Framing with u-channel material provides the necessary rigidity while allowing bigger build volumes. This rigid and stable structure is able to provide build volumes from 12"x12"x12" to 24"x24"x24", providing 1 to 8 cubic feet (1,728 to 13,824 cubic inches) in which to build your dreams.

The X- and Y-axes and the dual Z-axes are all built from 16mm guide rods and a precision rolled ballscrew assembly with 16mm linear bearings containing five ball bearing races. The five races not only support large loads because more balls are in contact with the rod, but crucially do not couple to any axis so that future wear will not introduce any backlash (wiggle.)

The ball nut bearings ensure precision by eliminating backlash of the carriage against the shaft. Similarly, one of the fixed ball bearings at the end of the central rod improves precision by eliminating backlash of the ball screw itself. Together, these low friction and tight components provide precise linear motion control with no backlash, prevent sideways motion and ensure that there is no coupling of the major axes. Any imperfections that are introduced over time by wear cancel each other out, so that the printer remains consistent along all axes.


Axes are driven through heavy duty cast aluminum timing pulleys and Kevlar-reinforced zero stretch urethane timing belts, which are turned by the high torque NEMA 23 motors on all three axes. These larger then common in the industry motors are driven through stand-alone 5Amp motor drivers. All motors are protected by covers.

Everything about this design adds the safety margin required to enable you to drive the motors hard without worrying about the quality of the print.

You Get One Heck Of A Rigid and Strong Machine

Together these specifications describe a printer that is rigid enough and strong enough to build detailed models.

  • T-Rex-12: The one cubic foot model, provides a 12"x12x12" build platform.
  • T-Rex-18: The 3.375 cubic feet (5,832 cubic inches) model, provides an 18"x18x18" build platform.
  • T-Rex-24: The 8 cubic feet model, provides a 24"x24x24" build platform.

All three models share all the custom machined blocks and plates, which are the most expensive components. In growing from one size to the next, we're changing only the length of the guide rods, ballscrews, structural U-channels, and the length and width of the print bed plate.

These machines are large enough and precise enough to allow builds that previously would have been shipped to 3D print services.

A calibration print across the entire print bed

Designed With The Future In Mind

3Dmonstr printers are all designed with the future in mind. All three printers incorporate the same modular design.  Many components are upgradeable, including the electronics and the extruder. All 3Dmonstr printers ship with a custom Main Controller built around an Arduino Mega processor board sitting underneath our own Main Distribution Board. The Mega runs Repetier firmware. There's also a Heater Controller Board (also an Arduino Mega with a custom shield, Heater Distribution boards, and 2 other minor connector organizer boards.

Open source software running on a mac, linux or PC computer allows makers to design models and communicate with the printers. Free design tools like OnShape, Tinkercad, and Sketchup can export STL layer files. Repetier-Host allows makers to select either Slic3r or Cura Engine to create the tool paths in G-code and then download that code into the printer electronics. The G-code that guides the printer movement can be monitored and controlled.

Multi-Zone Heated Bed

The heated printbed is a marvel of engineering. It is a complex module consisting of several layers (in top to bottom layers):

  1. Borosilicate glass printing surface, which will not distort, shrink or grow when heated because of its low thermal coefficient
  2. Individual, 6" x 6" x 1/8" aluminum heat spreader plates (one per Heat Zone), to help even out the temperatures. They are separated by a 1/4" air gap to help contain the heat generated by each Zone
  3. Individual 6" x 6" 60W silicone heating pads, one per Heat Zone
  4. Large insulation plate (12", 18", or 24", as appropriate) machined from 3/8" Garolite stock to trap most of the heat moving downward from the Heat Zones
  5. Electronics and cabling layer (Heater Distribution boards, junction connectors, cables, etc.) that distribute and control the power and sensor signals among the Heat ZOnes
  6. Second insulation plate, to cover the Heated Bed Module from below for safety

The Extruder

The extruder is an original design with a compact x-y footprint, so that multiples can be stacked without losing build volume. It's almost .5" smaller in width than most of the extruders out there and weighs about half too. We named it LittleTitan-Filament (LilTi for short). Because it's powerful for its little size, parts of it are made out of Titanium, and it's an extruder for filament.

By default, our printers are configured with two extruders, but adding up to two more is as easy as plugging in one cable, two little tubes and hanging the extruder on to the QuickMount bracket. More than one extruder will enable makers to add a temporary support material, add additional colors, or additional materials.  Each extruder can be outfitted with nozzles of different sizes (see here).

 4 extruders

Currently we handle PLA, ABS, HIPS, PVA, Nylon, PET, NinjaFlex, and Paraffin Wax.

Spec Sheet

See our spec sheet.