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Re: How accurate homemade Prusa I3 can be? April 14, 2015 08:33PM |
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great info! Word reading.Quote
Zavashier
I think your results are not perfect, but can a $500 printer offer perfect prints ? Appreciate the slicing operation introduce errors too. If your dimensions are within 0.2mm it's not that bad obviously. Except if you're into watchery or printing smallest caracters, you will never need a 0.01mm precision anyway. BUT, it's exciting to get the best print possible Calibration is one of the keys. But don't play with steps per millimeter on the XYZ axis. That values are calculated for your hardware. You will introduce errors to your prints, even for a 200mm part (because your adjustment will be good only for a part of that dimension). Obviously, you probably don't need to do that. Just calculate the steps per millimeter to match your components, then apply them. Playing with steps per millimeter on your XYZ axis is the last thing you wanna do.
As it was told above, some of your components and a wrong geometry of your printer can affect drasticaly your print dimensions. The wobble on your guides or your drive systems can introduce easily 0.2mm or more on your print dimensions. Too much temperature on the bed may corrupt the first layers. A print bed not flat enough too. A missaligned axis will do even worst. And so on. First, be sure your components are in great shape, and tune your mecanics and your structure as fine as you can, before to go any further. A good machine tune up is crucial.
Otherwise, be smart with your extruder settings. That will do a lot for your prints. Calibrate your steps per millimeter to extrude a perfect (as possible) 100mm (at last) run. Then, print a thin wall cube, with the same wall thickness than your nozzle diameter. Adjust now the flow on your slicing program to get the right amount of fused filament. Because the plastic expands when it fuses and you want to consider that. Now, if yours steps per mm for XYZ axis are set properly, you're probably as close as your print can be on your printer. You may have too small holes in your parts, but it's not a calibration issue, but a 3d conversion/slicing problem coming from radius interpretation. There's a slicer option to adjust that buy software.
It's a long run job, be patient and good luck !