It would be helpful if the correct belt tension (N) value was provided as well as the minimum and maximum belt tension value for all printer models. For those who already have measuring tools, it would be much easier to do the tensioning as well as obtain more accurate values.
Funny I was searching for this as well because I also have the specific tool which for anyone wondering is inexpensive and makes tensioning belts so much easier.
I came to the conclusion its like so many core XY machines. Around 5.5N - 5.7N works best for me, though im doing it to try and solve holes that aren’t round and a “Low X Axis resonancy frequency issue” I’ve had since the day I got the machine.
I got to 5.5-5.7N by these means.
I placed the machine on the ground (I have big flat tiles on the floor in the house), removed everything to easily get in.
I then loosened the screws at the back, then ran the tool head back around a dozen times, and on the last pass put it firmly at the back of the unit in the middle.
I then used these. I cant post links. search for Belt Tensioner Set Bambulab P/X Series on MakerWorld and its by the designer Dynarun.
These are a god send when it comes to belt tensioning on these machines.
I found the ones that just fit on either side, like just fit. For me it was 3mm on the rear left and 3.4mm on the right, if you’re facing the rear. According to Bambu from this point you should add 1mm tension on the adjusters, so i swapped them out for 4mm and 4.4mm.
At this point I used my trusty belt tension measuring tool and measured the X and Y belts from the centre. This gave me a reading of 5.2mm and 5.52mm.
I applied a little pressure on the lower reading spacer (the 4mm one), until the tool read 5.52 and then I locked both in place.
Im currently recalibrating then Ill print a circle and hope its better than the oval ■■■■ it was spitting out earlier.
Hope this helped.
Hi, it’s very interesting what you did, did you manage to measure after the calibration? how does it print now? I’ve been using the tools you indicated for a few months and they work. However, having bought the biqu tensioner, if the correct values of the belt tension were provided, using this tool would be much faster, easier and more precise.