Industry standard tolerances for 3D printing have largely been accepted at +/-.1 mm. Tighter tolerances are certainly available on the market place as extrusion companies continue to improve process, currently tolerances of +/-.05 mm are advertised by many. At B3D, our industrial extrusion systems (not the iExtruder) are used to produce filament. We can hold some of the best tolerances around, commonly +/-.05 mm.
The iExtruder has successfully extruded filament of various tolerance groups. The tightest tolerance groups have been within +\- .1 mm. All filament samples created are first run through the laser measuring system on the iExtruder itself. Then, for even more stringent testing, the samples are run through a $26,000 Zumbach Dual Axis Laser Measuring System. We only have the best at B3D, so we can offer the best! These systems insure utmost precision and detail for the analysis of every inch of filament created. (See www.zumbach.com)
Achieving these tolerances takes some though and time. Most importantly, the operator may have to make just one change to the iExtruder at a time and record the results. Once a few 'recipes' are established, they will create a library of knowledge which will accelerate future testing and filament extrusion of unknown materials.
Further in house testing has shown that tolerances of +/-.15 mm on 1.75 mm can still result in HIGH QUALITY PRINTS! See the pictures below.
These items were printed with off spec filaments.
In the 2nd picture, the two silhouettes were a comparison. The print on the left utilized high quality precision filament available for $34.95 / kg. The print on the right used high quality iExtrude generated filament. As you can see, it is nearly impossible for the average person to possibly identify the differences!
The iExtrude is an excellent alternative for entry level R&D on a budget and is a FANTASTIC educational tool. The end result produces high quality prints on commonly available consumer 3D printers.
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