This is a no-glue model of the BBC Micro, a microcomputer designed and built by Acorn Computers in the 1980s, very common in the UK.

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Print instructions:

The example print in te picture is scaled at 85%. Just print the red, black and white parts in the obvious orientation (as the STL files are), then insert the red part into the black part, and press the black part into the white part to interlock the two parts mechanically (warning: then you will likely no longer be able to disassemble it).