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Re: Timing belts - what's the story? - 12 years ago
There is a substantial difference between timing belt tooth pitches. Most obvious difference is that larger pitches will have more "cogging" on the small pulleys we use. Another difference is that belts designed for conveying have a large gap between the teeth in the belt and the teeth in the pulley. This leaves some play which creates backlash. Newer tooth profiles reduce or eliminate that sby 691175002 - General
Re: Prusa i3 Where Are You? 
- 12 years ago
I am a CNC guy and I feel that it has been misrepresented here. CNC has some of the most complex, accurate and fastest machines on the planet. You have greatly overstated the prominence of mach3, there are many other controllers available. My personal favourite is the KFlop ( ) which has a 1.2Gflop DSP, native 64-bit math and an FPGA. Honestly, when I first heard that 3d printers were usingby 691175002 - General
Re: Color mixing - 12 years ago
I was just thinking and I realized that with a color mixing extruder it is possible that plastic will sit in the melt zone without being extruded for many hours. Will ABS degrade if it is left at 230c+ for an extended period of time? In the worse case the plastic could sit for days at an elevated temperature or through several heat/cool cycles.by 691175002 - General
Re: Color mixing - 12 years ago
Do permanent thermochromatic dyes even exist in the temperature range for extruding plastic? Regardless, the use of such a plastic would be much more limited than a mixing extruder since a mix can produce a full spectrum of colours and mechanical properties given enough different feeds.by 691175002 - General
Re: Color mixing - 12 years ago
I've been thinking about how to effectively perform colour mixing for a while now. From what I gather, the two most important measures of a mixing extruder's performance are the level of mixing (toothpaste effect) and how fast the mix can change (fade time). After reading Corbett's report on color mixing, it is pretty clear that passive mixing is not a viable solution and an active system mustby 691175002 - General