Mechanics build guide

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Mechanical assembly of the Ultimaker revision 4 (click for an overview)
Click to view the 1.1 Frame...

1.1 Frame

Click to view the 1.2 X-Y axes...

1.2 X-Y axes

Click to view the 1.3 Extrusion head...

1.3 Extrusion head

Click to view the 1.4 Z-stage...

1.4 Z-stage

Click to view the 1.5 Material feeder...

1.5 Material feeder

Click to view the 1.6 Mounting the electronics...

1.6 Mounting the electronics

This revision 4 of the assembly instructions is online since April 16, 2013 and is meant for Ultimaker kits shipped from the 15th of April 2013. If you have an Ultimaker kit that was shipped before this time, please take a look at the revision 3 assembly instructions. For older revisions go to the bottom of this page.

Source(s): Mechanics build guide


What you'll need

Time needed
Time needed:
In total, for most people it takes between 6 and 20 hours to complete the assembly of a machine.   

Tools needed
Tools needed:
  • Hex keys (1,5 and 2.0mm)
  • Using the included 2.0mm hex-screwdriver saves an awful lot of time compared to an L-shaped hex-wrench!
  • Adjustable wrench or large size pliers
  • Consider also a cordless lithium-ion screwdriver (e.g. Bosch IXO) with a 2.0mm hex bit.   

An Ultimaker kit comes with many packs. See the page for your batch to check its contents: for example: batch 6's page.

There should be more nuts and bolts in the packs than you will need, so don't worry if you have a few left!

If you'd like to paint your Ultimaker before assembly, see Painting Your Ultimaker.

Source(s): Mechanics build guide

Basic design concepts


The design is almost completely metric (using millimeter and meters). Another system for physical dimensions is imperial (inches and feet). The nuts and bolts used are mostly M3 - they have a 3 millimeter diameter thread.

Source(s): Mechanics build guide

T-Slots and tabs

T-slots are used throughout the design to connect flat-pack parts at a 90 degree angle.

Some pictures may show square nuts in places other than T-Slots; just use hex nuts instead on your build.   

Source(s): Mechanics build guide

Why use wood?

Wood is an incredibly strong material for its weight. Moreover, everyone can modify a piece of wood by sawing, drilling or filing away material. You can also paint it! We want you to feel free to modify your machine to your liking. And we'd love to hear of your adventures! Another reason to choose wood over e.g. acrylic is that you will not easily crack wood when you over-tighten a bolt, while acrylic would break without giving you a warning. The Ultimaker is made of birch plywood. Birch is a really dense and sturdy type of wood, great for a long-lasting machine.

Source(s): Mechanics build guide

What else?

As designers of the machine, it's hard for us to think of which terms to mention, because we've gotten so used to them. Please tell us what else we need to explain here!

Prefer to assemble the Ultimaker in French?
A dedicated French community member has eagerly translated the Assembly guide as good as possible.
You can get here via the following link:

Source(s): Mechanics build guide

Current Ultimaker Assembly instructions

Source(s): Mechanics build guide

Previous revisions of the Ultimaker

(Here for historical purposes only!)

Source(s): Mechanics build guide