A Better Nickel Calibration Test
by MrJohn, published
The last nickel calibration test I designed gave no real feedback on how to fix the problem. This one should allow for measurements and corrections.
This one is exactly 21.21 mm wide in both the x and y. The slots are the same lengths (21.21mm) but a little wide (3mm)to disregard the width of the slot until the x and y are perfect.
"This is based on my limited knowledge of using, building a 3D printer (Prusa Mendel) and all the things I've learned up to this point (I started in March of 2011).
It has been pointed out to me that this may not be the end-all-be-all of calibration tests.
This test assumes that you have a working knowledge of calibrating your firmware steps per mm and are comfortable doing so. It also assumes that your extruder has been precisely calibrated.
Please use at your own discretion. It works for me."
Step 1- Print using zero extra shells, no scaling, or widen.
Step 2- Attempt to place a nickel in the circle once the print is done. If it does not sit perfectly in the circle with no extra space on the sides then move to step 3.
Step 3- Mark the two slots as needed to remember which is X and Y.
Step 4- Remove piece from bed.
Step 5- Measure the insides of each slot. Also, attempt to slide the nickel through. If the coin can not pass you will be increasing the steps per mm for that axis. Vice versa if coin easily passes through with space to spare.
Step 6- You should have two numbers from measuring the slots. I had 23 on x and 22 on Y.
Step 7- Divide your number by the width of the nickel (21.21mm) For me it was 21.21/23x= 0.9221739130434783 and 21.21/22y=0.9640909090909091
Step 8- Multiply this long number by your current steps per mm in the firmware. Mine was 42.42. So, 0.9221739130434783x*42.42=39.11861739130435
This number will become your NEW steps per mm for that axis. Repeat this step for Y.
Step 9- Upload this to your board and print again. Repeat until the coin barely fits through the slot and fits snugly in to the hole.
Step 10- To calibrate Z, simply use digital calipers to measure the height of the test piece and use the same method to change the steps per mm.
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