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Comment on How Many People Will Own 3D Printers? by David Harvey (@davidharvey)

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3D printers as they currently exist will remain tools for hobbyists & makers. There are 4 things needed for them to break out as mainstream products: 1. Ease of use: current printers are finicky, requiring too much adjustment and have too high a printing failure rate. But the biggest impediment is the software. 3D design software is too complex, and the tool chain from design to print is too cumbersome. Simple design software, and a "print" button that looks after the rest, will be needed before these become household items. 2. Colour: current 3D printed items are boring. The ability to print colour items would greatly enhance their desirability. This can be through multi-colour, multi-printhead designs, or by using a combination of 3D printing and inkjet printing to "paint" objects during or after the print process. Alternatively, heat shrink colour printed skins can be made to put over objects, similar to the advertising wraps you see applied to cars, trucks & buses. 3. Simple, inexpensive, high quality 3D scanners: following on point 1, design software is complicated. If you have a broken part that you want to replace, it would be much easier to scan & print rather than try to design a replica in software. Scaling is also a reason for scanning - you have an object you want to replicate, but at twice the size, or half the size. Scan, resize, print. 4. Adoption of "design for 3D printing": this could, in my estimation, drive 3D printing more than anything. Think of the inconvenience and expense of the parts inventories held by companies & repair shops around the world. When a replacement part for a vacuum or a car is needed, you often find yourself paying a ridiculous sum for the part, and/or waiting an inordinate time for it to come in. With current products, 3D printing can't change this much, as most parts can't be readily reproduced at sufficient quality. But what if product designers took this into account. What if a car company actively designed its cars so that as many parts as possible could be 3D printed. Dealerships & repair shops could install high quality 3D printers, and maintain a digital inventory of spare parts, which would be printed on demand for customers. No more waiting for parts, no more investing millions in spare part inventory. From there, one can see a progression to the home. Products that are sold can be designed for 3D printed part replacement. Just as you now can go on most manufacturer's websites & download instruction manuals, you could go on their sites and download files to 3D print parts. Print the replacement part yourself at home, or take it to your local Kinko's, Staples, or other 3D print shop. Companies could make these parts files downloads available for free, or charge a small fee for the download. In most cases, the 3D design files will already exist, as the product was probably originally designed this way. Many may think that companies won't follow this path - they profit from expensive parts & built-in obsolescence, and hope you give up on repair & simply buy a new item. There may be many who will think this way. But there will be companies who will see "design for 3D printing" as a strategic advantage. They can market their goods as easily repairable, and green, in that they are not as likely to end up in landfill because of a small broken part. Like the early computers, today's 3D printers are difficult to use, and accomplish underwhelming tasks. We don't yet have a VisiCalc for 3D printers. But I'm confident we will, and that 20 years from now, we'll be doing things with our home 3D printers that today we've not even thought about.

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