@Wissing So 9 years on... do you remember why you wanted a hollow shaft? I am looking for examples of people suggesting running filament through the shaft of a motor and into the extruder. Any mention in a public forum before FuseLabs patented the idea for their extruder would be good.by tombrazier - Plastic Extruder Working Group
2.1.3 is not yet released so no hurry there. But even with 2.1.2 input shaping adds value. One thing that 2.1.2 exposed and 2.1.3 will fix is that there is a problem with multistepping. This is where the processor is not able to generate step pulses fast enough so it starts generating them in bursts. This works surprisingly well up to a point and then it just causes the motors to skip steps. So tby tombrazier - Firmware - Marlin
I use Marlin input shaping myself with both X and Y axes on an ATMega2560. It makes a significant difference and, when combined with the stepper optimisation changes coming up in 2.1.3, allows an 8 bit board to achieve much higher speeds and accelerations than before. The physical components of my printer are nothing to write home about, it's entirely home-made from a combination of home-printed,by tombrazier - Firmware - Marlin
The screws do become loose in the posts over time as you predicted. So far I have managed this by ignoring it! When extruding, the bearings are pushed into the carrier so the screws are mainly there to stop the bearings dropping off due to gravity. I also have in mind that printing a new carrier is cheap and quick and replacing it is trivial. So I'd be happy to see it as a consumable. Always havby tombrazier - Tech-Talk
I have been corresponding with rq3 about the VDE extruder for some time now. I have just released a video about a version I have made using simple tools.by tombrazier - Tech-Talk