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Optical Tramming Indicator Bracket - Replicator 2

by Tunell, published

Optical Tramming Indicator Bracket - Replicator 2 by Tunell Feb 5, 2013
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Optical Tramming Gauge Mount for accurate build plate leveling


Update 2-15-13:
I've been having trouble getting consistent results using the first iteration. I'm uploading another version that will allow me to use the leveling process included in the firmware. There's an arm on the side that depresses the limit switch, tricking the bot. This puts the sensor exactly where the extruder will be when it is time to print.

Hopefully this will solve the consistency issues.

I used a Keyence fiber-optic DIN rail amplifier (FS-V31C) and sensor head. I like the optical solution because it doesn't touch the build plate while you're working. I used some post-it notes on each corner so that I would get uniform reflectivity for the sensor head. I also put a single note at rear center just above the thumb screw.

First, jog the printer head to slightly left of the the rear center and use a thin strip of paper between the extruder and acrylic to set the initial height. Don't use a business card, it is too thick. Ensure that your optical sensor is pointing directly at the post-it, and take a reading. Take readings and adjust at each corner post-it until all 4 readings are close to the same as the initial reading.

It may be possible to mount the sensor head next to the nozzle using a FU-35tz.

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Hi Tunell! How is this working for you now? Still satisfied?
So if I understand this correctly you put a piece of paper on the build plate and the FS-V31 shoots a light burst and measures the distance? How accurate is it? 1/100mm?
Does this need to hook up to any fancy gadget or is it plug ´n play, sorta?

Hey, just curious: Why did you mount the whole thing on the machine instead of just the fiber unit?

Also, the FS-V31C does not support sensor output. You need an FS-V31M for that.

Because I didn't think of just mounting the sensor head.
I have found the FSV31C to be everything I need for this project, except that it is NPN, which I suppose some people don't like

How precise and consistent are the measurements? I was able to tune my Rep1 down to 0.05mm/layers just by using careful settings and observation of the test prints. (It did take some time - so any method that would be more reliable and automatic would be welcome)

Well, this is still not automatic, although it could theoretically be automated I suppose. For me, I'd been having a problem around the outer corners. The center of the platform always works great, but the outer corners are always having print problems, so I couldn't ever use the whole platform for printing.
I'm still testing it, so I'll update soon.

FU66-TZ is a 90 degree sensor that could be permanently mounted next to the nozzle and run the cabling back up alongside the wiring bundle.

FU66-TZ is a 90 degree sensor head that could be mounted next to the nozzle and run the optics back up next to the cabling bundle.

$90 on Ebay http://www.ebay.com/itm/Keyence-FS-V31C-Photoelectric-Fiber-Optic-Sensor-/330616402784http://www.ebay.com/itm/Keyenc...

Is it possible to leave the module on the side of the printer and run the fiber optic to the extruder? Or would the fiber not hold up to the constant motion?

btw, the fiber would probably be fine unless you bent it too hard. Optics don't like to be bent, but they don't mind normal motion.

FU66TZ is a good 90 degree sensor head, I imagine it going right next to the heating element...
interesting possibilities.

that's a great idea, you know there are some 90 degree sensor heads that would be perfect for getting right under next to the extruder head. I'll have to look into that.


Can you please post a link to that kind of optical sensor?

Thanks in advance!