I finished my printer this weekend and printed out a few test prints. Overall it looks pretty good, but a few areas of the print could be improved like the top layer is not smooth. It looks like there is not enough material on the top horizontal surface after the infill. Maybe the infill should stop a couple of layers sooner and the top surface should be solid for a thicker surface. Maybe a design issue of the tool holder, I'm not really sure. If you look at the first picture you can see inside the square recess and see the honeycomb infill pattern like the solid layer over the top of the surface is not thick enough and the top horizontal surface did not come out smooth at all. It looks like it needs more PLA extruded for solid horizontal surfaces. Not sure. Here's a tool holder from Thingiverse and this took 14hrs to print.

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The vertical surfaces look pretty good except for the cupping at all the corners. I'm not sure what's causing that, but layer heights look consistent.

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Here's 2 more from different angles.

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The pictures look like there are some small gaps between layers, but there are no gaps. Just bad lighting, bad iPhone camera, and bad photographer (me). I made the mistake of using a heated bed with PLA and blue tape, I thought that was what I was supposed to do. Getting this off the build plate was seriously difficult even after a 2 hr cool down and I still have some tape adhered to the bottom of the print that will need to be scraped off I guess unless anyone has a good trick to get rid of the tape. I will try blue tape without heat and see if that helps with print release while still holding well during a print. The bottom covered very well and it looks like if I want a smooth bottom blue tape is not going to be the answer since the bottom has the transferred the tape texture and lines to the bottom surface of the print. Here is the bottom.

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I'm not unhappy with the first prints, although the first 2 prints weren't great until I measured the distance from either side of the build plate to the underside of the X axis aluminum extrusion and adjust the Z nuts until the extrusion was level to the bed (why wasn't this step in the instructions? Seems kind of important) and this made a very big difference in the squareness of the test prints . I did print a few small parts before the tool holder print, but I really wanted to know if the printer could sustain long print jobs without issue. At 14 hrs this gives me confidence that the printer is reasonably built and just needs a bit of tweaking here and there. The motors never got that hot, even the extruder motor. I could hold my finger on the motor indefinitely even at the 14hr mark, so I guess the driver must be close to a good adjustment. I also haven't really done any calibration yet either other than bed leveling, but my next step will be to calibrate the filament feed rate.

Like I said, I'm pretty happy with the early results and I'm sure this is going to work fine for the prototyping I want to do with this printer. I just need to address some fine tuning issues at this point. If any of you see obvious areas I should consider changing/adjusting please feel free to comment. All I've done so far is pretty much stock build and stock settings, so I'm sure there is lots of room for improvement. Comments welcome!