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Selecting A 3D Printer

There are many different technologies used for 3D Printers, and each technology has wide range of prices. Start by selecting the technology and maximum build size for your 3D printer, then decide if you want it assembled or as a kit.

Things to consider...

Who will be using the printer?
Will the students be running the printer themselves, or will it be accessible only to staff? Younger children and exposed moving parts are not a good mix.

3D printers are built either within a box, enclosing most of the moving parts, or open-frame, where everything is exposed, including pinch points.
A few printers are designed to be carried from one place to another and include a built in handle. Most 3D printers work best if set up on a sturdy surface and left there. Do you have a dedicated space or cart for the printer and supplies?
Print Size
What will you be printing? Most items will be under 4". However, some projects may require larger parts, e.g., the arm for a balance beam scale. Sort out how you'll use the printer and what size you'll need before making a purchase decision.
Filament Size
Most 3D printers create objects using spools of plastic filament. All else being equal, choose the printer that uses the smaller diameter filament – 1.75mm over 3mm. The smaller filament runs thru the print head faster, reducing the chance of a clog. As filament spools are sold by weight and not by length, a 1kg spool will give you the same print volume no matter what the diameter.
In addition to the printer, you will need the plastic filament to print with, some tools, and a computer to command the printer. A good quality plastic filament can make or break a printer. Use a brand recommended by the printer supplier, even if it's a few dollars more.
Build or Buy
3D Printers are available as kits or pre-assembled. You learn a lot assembling a kit, but pre-assembled allows you to start printing much faster. A kit can take anywhere from 3 days to 2 weeks to assemble.
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3D Printing Technologies

There are over 8 different 3D printing technologies currently available. This site introduces each of them. All have their distinct advantages. Many have distinct disadvantages, including limited material choices and high price.

The Fused Deposition Modeling (FDM) is the most common type for home/classroom use and it's the one that we will be talking about in this primer.

Teacher's Creative Fundraising For Classroom 3D Printer

This video shows how a Plymouth teacher was able to provide her students with a 3D printer in the classroom, and how her students are using it ... and learning.

YouTube URL
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Make Magazine 3D Printer Buyer's Guide

Make Magazine has a regularly updated buyers guide that covers the different types of 3D printers, what is available in each price range, and suggested 3D printers for schools.

Build or Buy?

If you have older and more-or-less responsible students, building would make a great class project, allowing your students to see "behind the curtain" as to how machines like this function and what goes into making them.

Otherwise, it's best to buy per-assembled, or build it outside the classroom -- maybe by a mechanically inclined college.

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