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Great. That’s the type of change that we are planning for the software if the upstream bug doesn’t get resolved promptly.
Hmm. We don’t have experience with pipx, so I’m not sure why that’s requiring a specific lxml version.
We’re planning to pin the lxml requirement in the next point release unless they fix that upstream.
This appears to be due to a bug in the latest release of lxml.
Try: python3 -m pip uninstall lxml
Then, python3 -m pip install lxml==4.9.4
I am able to reproduce the issue, and I will look into it.
I’m not sure if it’s normal because I’m not very clear on what it is that you are describing.
I’m not sure what you mean by “smoothly stroked”, and I’m not sure what you mean by “where strokes are varied”.
I’m also not sure what settings you are using, so I’m not sure whether or not you have missed something.
That said, a “dot that looks like a comma” at the end of a word sounds like an issue with pen height (and not related to the other things that you’re describing). If the pen height is not set well (between physical position and settings), it can be the case that the AxiDraw carriage begins moving before the pen is fully lifted from the page, and this is what leaves the tail on the pen stroke.
The Z axis motor on a standard AxiDraw does not apply any downward pressure at all.
The cause, and solution, are the same. And if you’re still having trouble, do use the contact form.
Here’s the schematic: http://cdn.evilmadscientist.com/KitInstrux/flickery_flame.pdf
There are six parallel circuits, each with a resistor in series with an LED.
An active stylus like an Apple Pencil will usually work without modification, on tablets like an iPad that are designed to work with it.
In some cases a passive (capacitive) stylus will not work on its own, since it is designed to read something with the same characteristics as a stylus contacted to a human body.
A solution that can work is to add a “grounding wire” — a conductive wire that touches the stylus and is electrically grounded. (It is possible to pick off a ground wire from the pen-lift servo motor, in case that is helpful.) In our experiments here that has generally worked.
However, your particular screen and stylus may not behave the same way, and you may need to experiment with it further.
Here are old reddit and stackexchange posts that describing the same general issue; you are certainly not the first.
Enhance a grounded stylus to trigger capacitive screen
byu/azertguigui inAskElectronicsTry flipping the wiring of one of the motors.
Are you still looking for a solution to this?
A path has to have at least two points. You can make these very close together, a line segment of width 0.01 mm is *much* smaller than a pen width, and should be indistinguishable from a dot.
Another approach is to make a tiny circle — again, start with your pen width or smaller — but that won’t be as small as a tiny segment.
Use short line segments, for example equal to the width of your pen (maybe 0.5 mm) or smaller.
You’re probably fine with a modest amount of added weight. The springs are pretty aggressive, especially when highly compressed. Weights have the advantage of a consistent load.
We can sell you one if you use our contact form or email our store to request it.
However, it really isn’t recommended for anything except the brushless servo. The main reason is that it increases the power draw of the pen lift servo. It’s potentially enough to exceed the capacity of the regulator that drives it, and/or enough to leave too little drive power left for the XY motion. (It also can reduce the lifetime of brushed servo motors.)
The brushless upgrade includes an upgraded power supply and does not use the voltage regulator on the AxiDraw control board, so it does not have these concerns.
