This repository contains OpenSCAD sources and generated STL models of the Acorn Risc PC power button and case locking pins.
The OpenSCAD sources are provided. They're parameterised in numerous ways so you can tweak the models. e.g. you can increase the level of detail, or change the models in ways to make them amenable to your 3D printing preferences.
Note: The parts were measured and recreated to an accuracy of 0.1mm but I can't offer any guarantees other than that.
RiscPC Spring Insert by Nic756655 https://www.thingiverse.com/thing:6777776
RiscPC Pegs 1 Slice by Nic756655 https://www.thingiverse.com/thing:6776757
Archimedes & RiscPC Half-Width Podule Slot Covers by distantcamera https://www.thingiverse.com/thing:5325053
Acorn RiscPC Power Switch by mcnewton https://www.thingiverse.com/thing:2854144