On Tuesday, classic computer collector Joe Strosnider announced the availability of a new 3D-printer filament that replicates the iconic "Platinum" color scheme used in classic Macintosh computers from the late 1980s through the 1990s. The PLA filament (PLA is short for polylactic acid) allows hobbyists to 3D-print nostalgic novelties, replacement parts, and accessories that match the original color of vintage Apple computers.

Hobbyists commonly feed this type of filament into commercial desktop 3D printers, which heat the plastic and extrude it in a computer-controlled way to fabricate new plastic parts.

The Platinum color, which Apple used in its desktop and portable computer lines starting with the Apple IIgs in 1986, has become synonymous with a distinctive era of classic Macintosh aesthetic. Over time, original Macintosh plastics have become brittle and discolored with age, so matching the "original" color can be a somewhat challenging and subjective experience.

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For the last three months or so, I've been learning to use (and love) a Bambu Labs A1 3D printer, a big, loud machine that sits on my desk and turns pictures on my computer screen into real-world objects.

In the first part of my series about diving into the wild world of 3D printers, I covered what I'd learned about the different types of 3D printers, some useful settings in the Bambu Studio app (which should also be broadly useful to know about no matter what printer you use), and some initial, magical-feeling successes in downloading files that I turned into useful physical items using a few feet of plastic filament and a couple hours of time.

For this second part, I'm focusing on what I learned when I embarked on my first major project—printing upgrade parts for the A1 with the A1. It was here that I made some of my first big 3D printing mistakes, mistakes that prompted me to read up on the different kinds of 3D printer filament, what each type of filament is good for, and which types the A1 is (and is not) good at handling as an un-enclosed, bed-slinging printer.

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For a couple of years now, I've been trying to find an excuse to buy a decent 3D printer.

Friends and fellow Ars staffers who had them would gush about them at every opportunity, talking about how useful they can be and how much can be printed once you get used to the idea of being able to create real, tangible objects with a little time and a few bucks' worth of plastic filament.

But I could never quite imagine myself using one consistently enough to buy one. Then, this past Christmas, my wife forced the issue by getting me a Bambu Lab A1 as a present.

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Hatsushima is not a particularly busy station, relative to Japanese rail commuting as a whole. It serves a town (Arida) of about 25,000, known for mandarin oranges and scabbardfish, that is shrinking in population, like most of Japan. Its station sees between one to three trains per hour at its stop, helping about 530 riders find their way. Its wooden station was due for replacement, and the replacement could be smaller.

The replacement, it turned out, could also be a trial for industrial-scale 3D-printing of custom rail shelters. Serendix, a construction firm that previously 3D-printed 538-square-foot homes for about $38,000, built a shelter for Hatsushima in about seven days, as shown at The New York Times. The fabricated shelter was shipped in four parts by rail, then pieced together in a span that the site Futurism says is "just under three hours," but which the Times, seemingly present at the scene, pegs at six. It was in place by the first train's arrival at 5:45 am.

Either number of hours is a marked decrease from the days or weeks you might expect for a new rail station to be constructed. In one overnight, teams assembled a shelter that is 2.6 meters (8.5 feet) tall and 10 square meters (32 square feet) in area. It's not actually in use yet, as it needs ticket machines and finishing, but is expected to operate by July, according to the Japan Times.

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