On 2014-06-24 at 23:19:15, geneb (geneb@deltasoft.com) wrote: > On Tue, 24 Jun 2014, silverdr@wfmh.org.pl wrote: > > > I wrote "one day" I'll print them myself. By that I meant that > > home-based 3D printing is not there yet. And even professional services > > like Shapeways don't offer precision high enough for this kind of > > things. > > > Wanna bet? I've got a machine here with a 250 micron diameter nozzle that > can reliably print 50 micron layer heights. I don't know what you have there but what I have seen for home budgets was not enough. Even yours is not going to be enough either: 250micron but you don't want to print the gear sideways, do you? And Shapeways says: "SLS is one of the most accurate 3D printing processes. The process has a layer thickness of 0.1mm." as well as: - maintain a wall thickness of at least 1mm, - accuracy is 0.1mm, - always keep a clearance of 0.6mm - and parts may have a deviation of 0.2mm. the thing is (AFAIR - it's been some time) 3.7mm and has 13 teeth. Now - give even one of them 0.2mm deviation. Or more than 5% in general. Now - wall thickness: 3.7mm (the diameter) less 1.5mm (the axis) divide by two and you are at 1.1mm... at full tooth length! So - basically - yes, I can bet... P. S. The dimensions are out of head so might be off but not so much as to change the whole perspective. -- SD! Message was sent through the cbm-hackers mailing listReceived on 2014-06-24 22:00:31
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