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Many of the people you find locally will probably have an inexpensive FDM printer like the ones you can buy on Amazon; those are the ones that extrude hot melted plastic filament/thread in layers. The layers are obvious and your parts will have a rough texture; they won't be smooth. Also, the parts have to be built up from the flat heated metal bed of the printer, so the bottom few layers of printing are usually not within tolerance. If parts have to nest together perfectly with minimal gaps, the inaccuracy of this type of printing can sometimes be an issue.
For better parts, you would want SLA (resin hardened by a laser) or SLS (nylon powder fused by a laser). These parts will be relatively smooth and much more accurate.
SLS Nylon is usually only necessary for functional parts that have to flex, resist impact, or will be used at high temperatures. It's more costly and the surface is a bit rougher than SLA.
SLA usually is friendlier for sanding to adjust fit, nylon can leave less smooth surface after sanding.
SLA is good for general purpose parts, it's usually quite smooth, accurate, and inexpensive. The material doesn't really flex (will crack under force). Parts are not heat-tolerant (up to ~60°C is fine though). There are a ton of different SLA resins with slightly different properties, I don't know the difference between them all and each vendor has their own selection.
Those part files you linked me to, I would be concerned about the wall thicknesses. E.g. 0.4mm on the clip, 0.6mm on the natch - those seem dangerously small to me, I wouldn't be confident they'd print correctly or hold up to long-term use without snapping.
Most places will accept STEP files; those are pretty standard.
Suppliers:
• I always use https://jlc3dp.com/ because the quality is good, you can get instant quotes online, and the price is quite low.
• If you don't like that JLC is in China, I have also used Forge Labs which is Canadian ( https://forgelabs.ca/stereolithography-sla/ ) but the price might be an order of magnitude higher.
• Aside from that, you'll have to google.
So I bought Digitalfire natch 3D print file in Step format and then used it to get a quote from these two suppliers.
I used an order quantity of 30 units:
ForgeLabs was $5.50 / unit to my door for SLA, just over $3/unit to my door for SLS nylon
jlc3dp was $0.80 per unit delivered to my door. And unit was $0.30 of this and shipping the other $0.50 (at 30 units) so could be pretty cheap if someone doing retail sales ordered a bigger quantity!
Buy me a coffee and we can talk