I have been spending some time in trying to learn 3D printing creating software, in order to create calculator pieces. In Shapeways, there are already several parts for the HP41c and other HP calculators. Look for designer davef, who has designed several parts for our calculator: back port doors, side battery doors, battery covers and other HP71b items. However, these never have exactly the look and feel of the real thing - they could even be considered nicer, but not the real thing.
But there is no need for nice finish for internal parts! So I am looking forward to create a piece that can be used in the innards of the calculators. You need to destroy - or abandon repair - a calculator to repair another, and that’s a quite expensive way of doing it! The price in Europe for defective HP41c is around 75-85 EUR. So any effort to create parts that help keeping in shape our best tools is welcomed - but it sure takes time for someone not used to it!
By the way, this is the Shapeways' HP spare parts site: