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50mm calibration angle

by ramai, published

50mm calibration angle by ramai Feb 24, 2013
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Summary

Here is a 50mm calibration angle used for calibrating your machine. This is designed to be small and fast to get calibrated quickly! I printed it on my Printrbot Jr.

The outer X and Y are 50mm.
The inner spaces are 30mm.
The whole thing is 5mm thick.
Each arm is 10mm wide.

Look at the instructions -->

Instructions

This works pretty well. Within 2 prints I had my printrbot jr fully calibrated to .1mm tolerances. Well enough to print an iPhone case that fits. I've included the STL and a sketchup file if you want to mess with it.
In case your new to calibration, I'm going to break it all down for you:

Usually in the custom Start g-code area in Slic3r you'll have 4 calibration values for X,Y,Z and E for Extruder.
If you don't have custom g-code in there, you'll want to add it. Here is what mine looks like for a printrbot jr.

G28 ; home all axes
M92 X63.0242 ; calibrate X
M92 Y62.7669 ; calibrate Y
M92 Z2071.4959 ; calibrate Z
M92 E650 ; calibrate E

You are welcome to use these as starter values. Just paste them into the custom g-code section of slic3r. (note: direct drive extruder starter value should be M92 E100)

To calibrate you first print this puppy out. When it's finished you'll want to measure it with a caliper, digital preferred. How close to 50mm for X and Y are you? X is the side to side when facing your printer. Y is the back and forth. And Z is the up and down. Bust out your calculator and run this calculation:
(Don't be scared, it's easy)
First multiply the current value of X by the length in the STL, 50mm. Then divide that number by what you actually measured. The result is your new custom-gcode value for X.
So in my case, say I measured the X of my print to be 48.25mm, I would do

63.0242 X 50mm = 3151.21 (current X value times the value in the model)
THEN
3151.21 / 48.25 = 65.3101 (result divided by my measurement)
So in my custom G-Code I would replace 63.0242 with 65.3101
Do the same for Y, and it works for Z too!

Re-slice by exporting it to G-Code and reprint that bad boy. Check your measurements, and do it all over again if you are off by more than .5mm

I hope this has been helpful, I know it's tough when you are first getting started.
For speed, I printed this object with 1 perimeter, 1 shell top and bottom, and infill of .1 (10%)

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I so want to try this out.

Problem is I don't understand about the custom G-Codes. Well all I know until now is just print. Zero knowledge about them codes. I am using a Robo3D if that helps,

Okay here goes.

I did just that. Adding the g-codes. Now my printer is only doing its autoleveling only like half on my printing bed. When it started printing, it is now printing on air.

Here is what I used :

G1 Z5 F5000 ; lift Z by 15mm
M104 S150; Set extruder and do not wait - preheat
M190 S[bed0_temperature] ; Set bed temp and wait to be reached
G28 ; home all axes
M92 X63.0242 ; calibrate X
M92 Y62.7669 ; calibrate Y
M92 Z2071.4959 ; calibrate Z
M92 E650 ; calibrate E
G1 Z5 F5000 ; lift Z by 5mm
M565 Z-0.8 ; set the offset for auto-leveling mechanism
G29 ; run auto-level
M109 S[extruder0_temperature] ; Set extruder temp and wait to be reached

Great tip, so helpful.

Quick and simple calibration piece. Excellent work. It printed nicely on my RepRap Prusa i2. Need to get a digital caliper to fine tune, but with my analogue one it seems very close to 50mm.

This is so helpful! I was having trouble with pieces not fitting together with my printer, but your step by step instructions for calibrating made it so much easier to understand and do. Thank you so much!

Works great!

One note of precaution using the custom GCode values: On my Printrbot Simple the ideal E calibration value is apparently 101, at E650 it looked like my extruder was about to launch into orbit! :D

Lets see a made one from the Simple. Im curious.

Haha good point, you must have a direct drive. Yeah, 100 is a good starting point for direct drive. I'll add it to the instructions. Thanks!

Thanks...I'm using cheap non-digital calipers, but your instructions definitely made a difference!

awesome, glad to be of help!

excellent and quick for xy calibration got down to x=50.05, y=50.00 with this piece help

thanks

well done, can't ask for better then that!

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