20mm x 20mm test square is slighty off square

Got a small problem... my test 20mmx 20mm cube is comming out 20mm (x) by 19.7mm (y)
I thought it was belt tension so I re-did the belts but got the exact same result.

Can the offset be compensated for in firmware?
Is there a table I can change?

Running Sailfish latest on a CTC with Mightyboard.

Thanks

Ray

Been told, but not doen this myself yet, that you can go into the Sailfish RepG install folder, and then go into the machines folder and there you will see a list of xml files for different machines.

Open replicator-sailfish.xml with a text editor and then find your new steps/mm and simply replace the old values with the new.

Then reinstall the firmware.

Nice one, ill give it a try later.

My prints are 2% smaller on the y axis, so I assume one just needs to modify the step/MM by 2%.

I let you know how it goes.

Ray

I would do it this way

http://reprage.com/post/46062359808/...our-3d-printer

This method also saves on wasting filament on making a calibration print each time.

I think the best way would be to measure and change the steps a couple of times and then print a calibration prints to make sure.

Looks like a good method, thanks for the link. I'll try this also.