POP2, firmware 2.9.xxx revo scan 5.3.3, 14,4 fps on win 11 via USB 3.2.
What i can/must change to success to scan this piece ?
I don’t understand why i loose tracking when everything seems nominal… 
Hello! Try to increase the exposure till red colors will be visible at left top screen (small amount of red dots on the surface of a model). If it does not help, try to calibrate the scanner.
It is as @Eugene3D says: set Exposure either manually or set it on “Auto” (activate the tab). If still not satisfactory use some scanning spray (dry shampoo might be enough, too). If it losses tracking I highly advise you to place some small pieces around the object as tracking aid which you can remove in the post processing.
also look into these tutorials:
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Hi @JMPlus
Please put on the market plate on the turntable and use marker mode for this kind of scanned objects … also if you put on the marker mode plate , and the dots are not cleary visible while rotation , you may adjust angle or add some environmental lighting , if still nothing is steady you will have to calibrate , this is s test to see how well your calibration works , and well visible markers will tell you if you need calibration or not .
Also not sure , but please don’t use the " hide plate" function if you did , this can create the jumps I see … also never put your objects flat on a turntable always try to elevate it slightly from the flat surface to preserve the edges of scanned objects .
Hard to track objects perform better in marker mode so pls try it first .
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Thanks to you three !
I’ve forgotten to say that with these parameters i’ve scanned without problem the white bust of the box.
It’s why i’m confused to have problems with a piece that seems not harder.
I’ll try with some marker point on the plate first.
Thanks again for all your help.
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Hi @JMPlus
A bust is organic model with lots of features that are random … what you trying to scan is not organic so slightly different approach is needed .
Please follow my tips to determine what works best , there is always solution to everything …
Ivan’s suggestions was also very good 
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