I think VDX is reffering to this patent: https://patents.google.com/patent/US2940322A/ which, as far as I'm aware, is the oldest recording of using canted bearing riding on a smooth rod to propel the bearing assembly (or rod, whichever way you look at it). https://groups.google.com/g/3dp-ideas/c/YGFYajwyVrc is a google group discussing a similar extruder to the Fuselab 3D one, though predating tby Skrogh - Tech-Talk
Without knowing too much about E-cigs, I would assume that the goal of temperature control in them is to be able to dump as much energy into the atomizer, without melting the filament (heater), as possible. So then the temperature of the filament is the control state of interest. In the hotend it is not the temperature of the heater that is of interest ('long as it doesn't melt or burn), but theby Skrogh - General
If you really do want to try this approach out, why not get a commercial tubular ceramic heater? The has one, but I've seen the heater type on both Aliexpress and Alibaba. You will still face the issue of the coil being significantly warmer, than what you are trying to control the temperature of - namely the plastic in the extruder.by Skrogh - General
I think the issue here would be that the nichrome wire will be significantly warmer, than the rest of the construction. As you want things to heat up quickly, and heat transfers faster, the greater the temperature difference. So reading off the temperature of the nichrome wire would not give any useful information.by Skrogh - General
ThorLabs makes some really neat stuff. I've only played around with their micrometers (which is were I got the idea - we used them to test some inductive distance sensors at a class). I didn't know they make so much other nice stuff. They have some 0.25mm pitch screws at a reasonable 4-10€.by Skrogh - CoreXY Machines
It might be a tad overkill, but you could use a micrometer. The pitch might not be a whole lot finer, but the larger grip will allow fine adjustment. You get an indicator as well. (so you're not just turning a screw by approximately 1/2 turn, but can actually see exactly by how much). Most of them have backlash compensation and a lock as well.by Skrogh - CoreXY Machines
Quotethe_digital_dentist Yes a full turn of the screw moves the end of the screw relative to the bed by 800 um, but at the switch it looks like 100 um, as if you had turned the screw 1/8 of a turn. It's the screw position relative to the switch that determines where z=0 is, not the end of the screw relative to the bed. this is where I think you are wrong. It is the screw position relative to theby Skrogh - CoreXY Machines
Quotethe_digital_dentist The screw threads are 1/32" = 794 um per turn. The lever is approximately 8:1. Turning the screw 1 full turn will move the switch end of the lever about 100 um, so it is less sensitive to the screw rotation making it easier to make small changes in the bed zero position. Yes moving the end of the screw ~800 um up will move the switch by 100 um, but for the switch to movby Skrogh - CoreXY Machines
I fail to see how the Z0 switch increases accuracy. 1 turn of the screw will offset the 0-point the same amount, no matter the "gearing" you put on the switch. Unless i missed something, you just made it so the new switch (switch + lever) needs to move deeper to trigger. Unless you're just using the switch to get a repeatable Z0 mark and the fine-tune the first layer height in software?by Skrogh - CoreXY Machines
In regards to using an IMU to measure the change in static tilt I am fairly certain from my experience with accelerometers that you will not get even close to 0.01 degrees of accuracy (the resolution might be there though). This is due to the bias drift. At angles close to no tilt, the tilt in radians is directly proportional to the change of measured specific force (acceleration + gravity) measby Skrogh - CoreXY Machines
I think the point he was trying to make about the "ears" vs. a wider shape is that with the "ears", while less energy will be lost the cold spot would be more concentrated. With a wider mount more energy would be lost, but also the cooled area would be spread out; this could mean that the maximum temperature drop be lower. This doesn't seem to hold though. I did some simulations over my breakfasby Skrogh - CoreXY Machines