A bit of both Nealeb!
The difficulty I have trying to print a CAD drawing does deter me, so the A3 printer sits there gathering dust and an untidy heap of papers and things. I hit a solid barrier with SolidEdge well before discovering its printing method; so do not use it though it's still installed.
Reading the various replies above does strengthen the idea that I may be better keeping the A3 printer (HP OfficeJet 7510) and using it for all printing tasks. That despite its extended, slow, ponderous series of loud crashes and bangs as it wakes up; and more seriously its absurdly under-sized copier platen. It can take some twenty minutes to come to readiness.
It's possible that if I do this, retiring the A4 printer (HP DeskJet 1510) as I use up that machine's inks, it will remove the 7510's ink-clogging problem I think it has. I could try using the A3 printer next time I print anything A4 or an envelope.
With printing only very occasional photos and no CAD "models", I am not hitting the colour inks very hard on either printer; but that disuse might let the ink nozzles dry closed..
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The 7510 has only one paper tray so you do need change paper and the tray fences. That would be annoying in business use but does not matter when printing anything only infrequently, at home.
Indeed, an advantage because when the rather crude plastic tray and delivery shelf above it are extended to hold A3 or US near-equivalent ANSI 'B' size sheets, the shelf does not cover the paper and tray enough to exclude dust. Though really, I ought cover the entire machine.
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It is possible to save a TurboCAD drawing in .bmp and .jpg; but I don't know if you still need use its 'viewport' system. The image will not be to scale and the dimensions printed may be of that, not the manufacturing ones intended.
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I've had odd glimpses into the USA and its fun with the system set by the ISO of which it is a fully paid-up member. It is one of only three countries not using the Metric System for everyday life. I think its fellows are Liberia and Myanmar (ex-Burma)! US scientists and many engineers do work in metric; and an American servicing a car will need know at least M-series fastenings and spanners if it is imported.
Some years ago I contributed to a Q&A site called 'Answers'. I found two areas where I could help here.
One was private swimming-pool owners trying to calculate doses of disinfectant and other additives delivered in litre-volumes, for pools to feet and US Gallons. I would show them the sums in full, being careful myself to use their 16C wine-trade, not standard UK, gallon.
The other was clearly school-children struggling with conversion-sums in their homework: I would show simply multiplying the given values by standard co-efficients that are very widely published. (Maybe even in their text-books, though I didn't say so!) Sadly these were often pounced on by two particular individuals who wilfully mad the process as absurdly complicated as possible – sometimes with errors in their own arithmetic.