[4th Dec 18] JGAurora A5 Euro buyers: A5 in stock in Gearbest Europe shipping from Czech Republic.
Also available from their Spain warehouse - buy here.
Click here to check out this deal!
IR Sensor Upgrade Wiki Changes (Comments and Suggestions)
Ive been putting some work (more hours than i care to admit) into improving both the general understanding and the documentation for this on the wiki over here. https://jgaurorawiki.com/a5/bed-levelling-probe
Before my edits, the main advice was to go to a Thingiverse post where there is a pre-modified firmware and a quick guide on what do to, but that doesn't fit the WIki format. WIki's by definition should be self contained with external links frowned upon as the source material can disappear and than you have...nothing, no info. How bad would Wikipedia be if it was just links to random google pages?!?
I have written an entire guide based on my adventures so far getting this amazingly useful upgrade to work. It includes full steps for firmware modifications required which is great if you've already made custom firmware alterations and don't want them wiped by just flashing the pre-modified firmware provided. It also contains more detailed wiring guides and full info on how to get an acceptable repeatable trigger distance.
I know the general feeling prior to this is that whether its due to the glass bed, or the Black Diamond coating, the IR beams repeatability cannot be trusted. However, I've done plenty of research and testing and one thing stood out. The original designer specifically created the sensor to pick up on glass. It does 100% do this. However I guess since the sensor was designed, 3d printer layer heights have gone down, even a few years ago, an average cheapy printer could do a 0.3 or 0.4mm layer height. Nowadays an average printer is at 0.2 or less. But theirs really really simple things you can do to improve the accuracy to something more reasonable, like down to 4 microns (0.004mm) such as painting the glass bed.
What this means is that its NOT the black diamond coating, OR the fact that its glass, its the fact that only a weak IR signal gets reflected by the glass, the rest is coming from the aluminium bed, and if the IR beam has to travel entirely though 2 mediums (black diamond then the glass) before bouncing from a third (the aluminium bed) of course you're going to lose some accuracy!
One amazingly useful video is this one it busts many sensor myths and pits them all against both glass and aluminium. Something especially stood out to me here. Out of the IR sensor and the much hyped BL Touch, the IR sensor actually has a MUCH better standard deviation (check that graph out at this timestamp URL ) so perhaps give the IR sensor another shot?
Also, that edit was my first major change on the wiki, so any comments or criticisms are welcome.
Now I just need to wait for my new heated bed to arrive so I can get my machine back up and running. Damn slow boat from China….