The Printerbot Jr. is a great choice for beginners to 3D printing. It is small, portable, and affordable.
Recently I completed the Printrbot Jr kit. It took a few days to build and a few more to get things dialed in to obtain excellent results.Here's a list of of my 'sticking points'.1: There are 'no' printed instructions with the kit. Just a BOM and paper showing the cut wood parts. You must got to printrbot.com for the 'on-line' instructions. Personally, I hate 'on-line' only instructions. As complex as this unit is,Printrbot should include at least a basic assembly guide to augment the on-line manual.2: Our kit did not have the hole drilled in the base top for for the z stop rod, so we had to drill one.3: The instructions don't show the proper way to plug in the large Kysan motors. The plugs are not keyed, and will plug in either direction! This won't hurt anything, but the motors will run backward if you have them in wrong, which I did.3: The all important X and Y-Z bearing sets are held in place as a plywiood sandwich, which is ok, but they're totally relying on 'threads in plywood' to hold everything together. Not really good for the long term, but ok I suppose.4: No software is included. You need to download it, along with the usb driver. The links are given in the on line manual, but they could have included that on a CDR.5: The X-Y-Z stop micro switches, which determine the x0 y0 z0 starting coordinates are only held down with a zip tie, and are not screwed down.These are but a few of the little things that required us to re-work as we assembled it. Expect to re-work a few things as you build. It is definitely not like building a Heathkit, where everything is well thought out for assembly. This may be 'nit picking', but with a machine such as this, the 'devil's in the details', and the print quality and repeatability is directly related to the build quality of the unit.My overall opinion:Over all, this printer is very good, once tweaked in. However, it should be considered a 'work in progress' kit, that will require considerable tinkering with to get things right. Don't expect beautiful 3D prints right out of the box! There are numerous parameters, both mechnical, and software settings that will need to be adjusted to get things right. If you are not very good with complex mechanical assemblies, it may prove to be a very difficult project to attempt. It is very doable if you put the time into it.Recommendation: Before purchasing, go to the printrbot.com website and read all of the documentation thoroughly before considering purchasing this kit. I did this myself, and it helped considerably. There were still a number of issues, but I did eventually end up with a really good/solid machine.
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