# Tag Info

3

For an easy test, try manually pulling the filament through the U-loop of guide tube. How hard is it to pull through? It should only take 1-2 lbs of tension at most. Then do a "tug test" on the extruder. Start it loading and grab the filament by hand to try to stop it from extruding. The Replicator 1/2/2x extruder style can typically pull ~8-10 lbs of ...

2

This basically depends on the torque your stepper can produce! A high torque stepper (the bigger the height of the stepper the more powerful the stepper) can push filament with much more force than a stepper motor with less torque. To increase the torque you employ a gear ratio to reduce the speed. As torque and speed are inversely proportional, a reduction ...

2

$\frac{(2.85\ mm)^2}{(1.75\ mm)^2}=2.65$ which is the reduction you would want assuming a 1.75 is direct drive. In this answer I am comparing the amount of filament flowing though the extruder by using $\pi \times r^2$. Dividing the 2 values gives the ratio of the 2 speeds. A gear ratio is them used to change the speed.

2

If your gear skips at the same place each time I have found on my machine that the gear does not fit the motor shaft properly and has a larger gap between the gear and the idler roller. Check to see if there is a thicker buildup on one side of the gear than the other. On my machine what I had to do was to use a spare motor cable and watch the gear as it ...

1

That is perfectly viable these days in Marlin firmware, there are options for setting this up using the configuration file, e.g.: // :[0, 1, 2, 3, 4, 5, 6, 7, 8] #define EXTRUDERS 1 ... ... ... // A dual extruder that uses a single stepper motor //#define SWITCHING_EXTRUDER #if ENABLED(SWITCHING_EXTRUDER) #define SWITCHING_EXTRUDER_SERVO_NR 0 #define ...

1

During normal extrusion backlash has no effect. During retraction you can perfectly compensate by increasing retraction length slightly. Backlash cannot be taken into account for pressure advance, but unless it's a lot, it should not cause issues: pressure compensation is a second order effect and does not need to be tuned super accurately to produce results....

1

First of all, let's look at the geometry: We have a static XY and changing Z on our build plate. This mitigates several problems we might have faced in a different setup, mainly that our lead screw has loads changing from one face to the other: all loads always go into $-Z$, so the lower surface of the Trapezoidal threads in the brass nut of the bed carrier ...

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I use an air bulb to clean dust out of teeth, but the clicking sounds like the stepper has too much mechanical load so i am guessing there is something solid stuck at that point. Poke it off with something sharp.

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I mostly use a tooth brush for that kind of problem

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If you are able to remove the gear, as I suspect you can, a useful tool is the file card. It resembles a flat hair brush but the bristles are short wire, very stiff. In traditional use, it removes metal shavings from conventional metal files. It will easily remove plastic from between the gear teeth. If you are unable to remove the gear, but can access a ...

1

I have a few hundred printing hours on a Monoprice Dual Extrusion, which is essentially the same thing. I've had a couple random issues that lead to filament stripping by the extruder motor: Clogs (either a buildup of material over time, or from over-retraction) Filament kinks around the spool holder Some other restriction of the spool's rotation I ...

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