This chapter will guide you through calibrating and preparing the printer for its first run. Starting with tensioning the belts:
⬢The left screw adjusts the upper belt.
⬢The right screw adjusts the lower belt.
⬢Double-check that the M3x30 screws in the belt tensioners were lubricated during assembly.
WARNING: Incorrect procedure may result in damage to plastic parts or seizing of screws. Before adjusting the belt tension, read the dedicated article:
If your gantry is slightly misaligned, read the comments in the guide. I found this by TheEarth especially helpful: "The gantry alignment should be done like in this video, using the uniwrench. https://www.youtube.com/watch?v=myLZtFy0nhw Thank @PrusaSupport for hinting me to this video, please implement it in the article!
-Loosen the belts completely. Carefully, as the square nuts can fall off the belt tensioner if the screw is removed completely. -Check which side sits against the front end (tight side) and which one has to be pushed towards it to touch it (loose side) -Put an uniwrench or something that is thick enough between the tight side and the front end and slightly push on the loose side to correct the skew. - Do the belt tuning (consider using a dedicated app for the measurement, e.g for iOS "Schall") - check the gantry alignment again, if off !carefully! use the uniwrench"
For those that are having a hard time tuning your belt tension, the goal is to have the belts vibrate at 95Hz. What I have found that works is after you have the the gantry lined up so there is not gaps on either side. For the upper belt set the frequency to 95Hz, then adjust the left screw until you see the top belt wiggle. For the bottom belt, set it to 95Hz and adjust the right screw until the bottom belt wiggles. You will need to repeat this a couple times to get the belts adjusted properly.
"The gantry alignment should be done like in this video, using the uniwrench. https://www.youtube.com/watch?v=myLZtFy0nhw
Thank @PrusaSupport for hinting me to this video, please implement it in the article!
-Loosen the belts completely. Carefully, as the square nuts can fall off the belt tensioner if the screw is removed completely.
-Check which side sits against the front end (tight side) and which one has to be pushed towards it to touch it (loose side)
-Put an uniwrench or something that is thick enough between the tight side and the front end and slightly push on the loose side to correct the skew.
- Do the belt tuning (consider using a dedicated app for the measurement, e.g for iOS "Schall")
- check the gantry alignment again, if off !carefully! use the uniwrench"
What I have found that works is after you have the the gantry lined up so there is not gaps on either side. For the upper belt set the frequency to 95Hz, then adjust the left screw until you see the top belt wiggle.
For the bottom belt, set it to 95Hz and adjust the right screw until the bottom belt wiggles. You will need to repeat this a couple times to get the belts adjusted properly.