Has anyone tried using a thermocouple + OpAmp? Donby Karl - Mechanics
Hi Zach, as i understand, the trouble with the Mk I extruder driver was that it slipped too easily, especially with CAPA? Thats why the thread-drive was introduced for Mk II / Darwin. What I havenby Karl - Mechanics
Not wanting to offend the Mk II designers, or anyone else, but exactly what kind of stiff filament with 3 mm diameter are you going to use with the present extruder? Designing a tool for hypothetical future uses seems a not so good idea to me. Darwins job is to print plastics, and most of them can be made to a flexible filament. OK, thereby Karl - Mechanics
No need for a hopper, see attached drawing. Flexible tube a bit bigger than max diameter of granules, exchangeable so you can use different granules. Small stirrer in the reservoir to keep things going. Iby Karl - Mechanics
SOI Sentinel : I think it might be a good idea to remove the reservoir from the extrusion head, because it increases itby Karl - Mechanics
The much more elegant way would be to make better designs for your objects. I you need a cube, say, which is going to get most load along one diagonal, the thing to design is not a solid cube, but an emtpy one with an internal structure that reinforces it along that way. Add some light supports inside so you can print the upper face of it, and you get a cube with has nearly the same mechanical prby Karl - Mechanics
And I forgot ... As some of the Energy to melt the granules comes from the drive, the current through the heater needs to be lowered if the extrusion speed is increased. So you need an adjustment to the software.by Karl - Mechanics
Attached a sketch of an auger screw to be printed in PE (in two halves), then cast and moulded like the one on blog.reprap.org. As shown in the drawing, the plastics is only melted in the compression zone in the middle, because of the compression (and the heater, of course). The heating wire should perhaps be coiled on the lower half of the tube, which Iby Karl - Mechanics