One thing to keep in mind when looking at the cheaper 3d printers is they are often optimised for PLA and 0.4mm nozzles. As such the extruder may struggle with pushing filament through a 0.2mm nozzle, also the hotend may struggle to keep the temperature stable when pushing through more filament with larger nozzles.
I doubt any of the printers around the £150 mark would be able to print ABS/Nylon/PETG successfully and continually due to the higher temps and preferably a heated enclosure that are required.
You can upgrade the extruder and hotend on most printers, but this is a DIY, often a more expensive route to take, both in terms of money and time you'll invest.
Depending on application, i.e for gears etc, you may want to look at either the resin based machines, although material for these is more expensive and it is more messy/smelly, or a 3d printer that will cope with the higher temperatures PETG/ABS/Nylon require out the box.
3D printing is fun, being able to create a custom part in a few hours in your workshop is great, but you have to invest time if you want to get results that differ from 0.4mm nozzles and PLA..
I've successfully printed PETG and Nylon12/Carbon, on a CR10 with a Bowden E3D V6 hotend, in a warm workshop. But suffered de-lamination on quite a lot of prints due to temperature fluctuations within the work shop. I had to get it to a stable 20ish degrees before I could get successful results.
The clamps are great!! Once uploaded I will probably print myself a set or two!
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