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[–] • 1 pt

Its usually recommended that you print glock frames at least on PLA+, as it was designed with that in mind.

But I've seen people print with a ton of other types of materials, like nylon, tritan, and even resin from resin printers.

When the printing time is not a concern, and cost is even less of, printing a lower just for it to crack or break is not really a problem. It will never explode or badly hurt the user, so a little experimentation is OK.

[–] • 1 pt

PLA is a low quality material which I believe should only be used for toys. Carbon or glass fiber nylon is what should be used if possible.

Not familiar with Tritan.

[–] • 0 pt

PLA+ is PLA mixed with other materials and has more strength and resistance to temperature than normal PLA.

Don't disregard PLA+ so easily, because even though there are better materials, it is still quite capable.

For instance, the FGC-9 is designed with PLA+ in mind and works great.

[–] • 1 pt

I understand PLA, but it naturally biodegrades and the glass temperature is far too low for my comfort, even with fibrous binders. The FGC-9 build manual states not to fire more than a few rounds at a time due to heat. It is not a material that should be used to withstand sustained temperatures.

If you can get your skill up, and maintain a constant build volume temperature, polycarbonate is the best material for the price. Other than that PEEK or similar alternatives are the best.