Oh I know what they’re limited to now. But imagine a 3D printer that is capable of writing its own PCBs. Hell we have people with their own basic lithographers, it can’t be that far off, though probably a decade or two, granted.

Good enough for me! I’m not looking for a perfect solution, I can work with incomplete products with weak parts, as long as those parts are readily replaceable

Lies!

I can 3D print all the parts of an Abacus, giving me tens of bits of memory and a calculating device!

But yeah, on the serious side, nobody is going to be 3D printing any time soon, if ever, the kind of stuff small enough (and hence with sufficient memory densities for modern applications) to require advanced lythographic techniques and clean rooms to make, even if somebody went to the trouble of figuring out printeable materials for each of the kinds of layer (undoped semiconductor, various variants of doped semiconductors, conductive layer, isolating layer and others) currently present in ICs.

You can print “kiddy electronics” (really big transitors, resistors, capcitors and so on) on flexible substrates, but that’s way too big for any halfway decent memory densities (the Abacus joke is only half joking).

Is it not possible to print a plastic tape storage device?

Here’s the summary for the wikipedia article you mentioned in your comment:

Magnetic-core memory was the predominant form of random-access computer memory for 20 years between about 1955 and 1975. Such memory is often just called core memory, or, informally, core. Core memory uses toroids (rings) of a hard magnetic material (usually a semi-hard ferrite) as transformer cores, where each wire threaded through the core serves as a transformer winding. Two or more wires pass through each core. Magnetic hysteresis allows each of the cores to "remember", or store a state. Each core stores one bit of information. A core can be magnetized in either the clockwise or counter-clockwise direction. The value of the bit stored in a core is zero or one according to the direction of that core's magnetization. Electric current pulses in some of the wires through a core allow the direction of the magnetization in that core to be set in either direction, thus storing a one or a zero. Another wire through each core, the sense wire, is used to detect whether the core changed state. The process of reading the core causes the core to be reset to a zero, thus erasing it. This is called destructive readout. When not being read or written, the cores maintain the last value they had, even if the power is turned off. Therefore, they are a type of non-volatile memory. Using smaller cores and wires, the memory density of core slowly increased, and by the late 1960s a density of about 32 kilobits per cubic foot (about 0.9 kilobits per litre) was typical. However, reaching this density required extremely careful manufacture, which was almost always carried out by hand in spite of repeated major efforts to automate the process. The cost declined over this period from about $1 per bit to about 1 cent per bit. The introduction of the first semiconductor memory chips in the late 1960s, which initially created static random-access memory (SRAM), began to erode the market for core memory. The first successful dynamic random-access memory (DRAM), the Intel 1103, followed in 1970. Its availability in quantity at 1 cent per bit marked the beginning of the end for core memory. Improvements in semiconductor manufacturing led to rapid increases in storage capacity and decreases in price per kilobyte, while the costs and specs of core memory changed little. Core memory was driven from the market gradually between 1973 and 1978. Depending on how it was wired, core memory could be exceptionally reliable. Read-only core rope memory, for example, was used on the mission-critical Apollo Guidance Computer essential to NASA's successful Moon landings. Although core memory is obsolete, computer memory is still sometimes called "core" even though it is made of semiconductors, particularly by people who had worked with machines having actual core memory. The files that result from saving the entire contents of memory to disk for inspection, which is nowadays commonly performed automatically when a major error occurs in a computer program, are still called "core dumps".

^{article | about}