Peter,
The scan files came from a friend with the scanner, these were converted to .stp and then sliced and printed on a Prusa Mk4S. No idea what type of scanner was used, definitely not from a phone app.
Although the Mk4S is only about 2 years old, it's pretty dated by todays standards. It's a single colour machine without heated enclosure, for the price, one now can buy multi-colour enclosed printers that offer more versatility and better print results. Bamboo Lab has pretty much taken over the desktop 3D printer market, the competition is fierce.
As I am more focussed on making technical odds and sods with no need of multi-colour prints, the Mk4S will see me out for quite some time yet. It's a very sturdy machine that has been very reliable. I intially bought the Mk3 and then up-graded to the Mk4 and then Mk4S. End of the road though for this model type. The major restraining factor now is printing temperature, I cannot yet take advantage of the high-strength and temperature-resistant materials now available.
@Mark, after attaining my engineering degree in the early 1980s, the entire metal-working industry took a pretty fatal nose dive here in Germany, resulting in me never working a single day in my trained profession/s. CAD and CNC were just emerging at the time, but as I was being distracted by other joys in life, I never found real interest in the technologies at the time and having one-offs or small runs made by CNC was still horrendously expensive. 3D printing fascinated me from the beginning, I eventually bought my first Prusa machine in 2020 and then inevitably got stuck into CAD. While seeming quite daunting initially, I had learnt drafting on paper with pencil and t-square, it turned out to be far easier than I had feared. I've advanced from simple brackets and spacers to working components of my own design for my bikes and cars as well as throughout our household. Lots of inspiration to be found online, the own imagination is the sole boundary!
Being able to design stuff yourself and supplying your favourite local CNC guy with a digital file makes one-off components quite affordable. I recently designed footrest/exhaust hangers for a friends Barcelona replica and recieved a quote of around €50/piece to have them laser-cut from 6061 alloy, half that when commissioning 2 sets. For that price, I'm not even going to unpack, or even start searching for the jigsaw to start cutting...

Turning up with a rough sketch on the back of a fag pack is what makes CNC expensive, lots of costly time goes into designing and programming, material costs are usually quite minimal in comparison. Working from a template and basic dimensions, design of the hangers, as well as the revision after I decided I had over-done the weight saving, took about 30 minutes using Fusion 360. Printed out a sample costing about 25 cents, sent it to the friend 150km away and recieved the OK to go ahead 2 days later.
@Rob, with your modelling background, CAD and 3D printing would be an ideal supplement to your skill set, especially so that it has now become so affordable. A word of warning though, it is highly addictive!
Never too old to learn...
piet