Here is my blog where I describe in detail my build of an EDUC-8 in 2007. I also give lots of information on EDUC-8 and plenty of links to software and other resources to build your own EDUC-8.

http://www.sworld.com.au/steven/educ-8/

In fact, the EDUC-8 shown at the top of this forum is the one I built!

From Gwyllym's GitHub...
BOM (LibreOffice format)

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Gwyllym Suter's EDUC-8 Schematics

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Here's the problem I had slicing this model for FDM printing. Resin may be the best option.

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AliExpress -> 805 Strip connector 3.96mm Pitch

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BOM:

• 8 x 36 pin TYPE A
• 4 x 72 pin TYPE A

Switch Lever Prototype Files

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These files may be difficult to print with an FDM printer - a nozzle 0.3 mm or smaller is recommended, as the curved body of the design is extremely thin. It is probably better to consider printing these in resin instead.

Note: the switches available on AliExpress already have the lever and it is only necessary to print your own if you want period-correct colouring.

AliExpress -> Momentary Action Switches
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AliExpress -> SPDT switch
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These Rear Card Handles attach to the 6 rear circuit boards (2 handles per board). Thus, 12 are required for a full set.

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Gwyllym's GitHub repository
EDUC-8 recreation by Gwyllym Suter