The attached files (f1-calibration.zip.form (311.0 KB)) should help you get setup and printing accurate models pretty easily. All files are zipped into an archive, then renamed to have a .form extension so I could upload them here. Rename stripping the .form extension, then decompress the archive to access the three files in it.
Overview of Form1+ Calibration Steps
* Determine how 'off' the machine is at it's default settings by
printing the stepped calibration object, and then carefully
measuring it with a metric digital or dial caliper.
* Enter the precise, actual measurements into the spreadsheet
calculator.
* Set X & Y scaling in the printer to the values from the calculator
with the 'Fine Tuning' menu in Preform.
* Scale each model in *all axes* by the amount shown in the calculator.
Detailed Steps
~~~~~~~~~~~~~~
1.) The first thing to do is to reset the fine tuning scaling to factory
defaults for X&Y. This is in the help menu I think. The printer
needs to be plugged into the computer with USB to do this. If you have
changed the z-offset to adjust the way parts stick to the platform, you
can leave that as you have it. We'll fix Z in Preform itself.
2.) Print the stepped calibration object at full scale. You should print
it at the resolution you typically print at. Fully post-cure the
calibration gauge before removing any supports. Three or four hours in
direct sunlight should be good.
3.) Carefully remove just enough supports so your caliper can get
in to measure across the wider steps for X&Y, and down to the ledge
with the caliper's tail for Z. Keeping most of the supports and the base
attached keeps the gauge more rigid and accurate.
4.) As you measure across the steps, enter these actual measurements
into the spreadsheet calculator. When you've entered all of the X, Y,
and Z measurements, the adjustment values will be correct in the lower
part of the calculator.
5.) Adjust X&Y in the 'Fine Tuning' control menu of Preform to the
values calculated. This will be a one-time setting, and will stay this
way.
6.) IMPORTANT: Every object you print from now on MUST be scaled in all
three axes (e.g. the overall scale) to the value from the calculator.
Do this as the first thing you do to the model when you bring in the
stl file. If you add supports first, then scale it, all of your
supports disappear, and must be redone.
7.) To verify the calibration is working correctly, print the 2cm
cube gauge *at the calculated scale* and measure it for accuracy.
Good luck, and let me know how it works out for you.