You can't. A netfabb repair sends your model off to a cloud based server (an autodesk server as Netfabb is their software). They do the repair and send it back. It has nothing to do with your computers processing power.
Neophyil gave correct (simplified) explanation.. for more than that, a lot of data transfer analysis would be necessary (and probably some insight into netfabb code).
Imagine this scenario: you send file to netfabb, but whole job isn't actually done there. Quite possible netfabb sends chunks of (your) data back to you and instructs your PC what to do with that chunk of data. When that is done, your PC sends the result back to netfabb... and process repeats until full job is done. Yes, CPU time is precious even for Autodesk.
There exist (scientific) projects where everyone can participate by making PC (CPU actually) available for solving heavy calculations. After starting such application, you're asked how many (of available) cores you're willing to share and after that you start receiving chunks of data which is needed to be processed on your PC. Once it's finished, result is automatically sent back to server and you receive new packet of data.
Back to netfabb... maybe it can utilize only two cores...? I don't know the answer. Maybe you can ask on some netfabb specific forum and get more info there.
Yes its because of Windows version. The fix through Netfabb is only available when on Win 10. However you can use a normal browser to go to the netfabb website and if you have an autodesk ? account you can log in and repair models through the browser. Its just not as convenient.
I did try to adjust the Z leadscrew on my third failed netfabb experiement, unlike cura the ultimaker really didn't like it. (after that it decided it didn't like the 0,0,0 position and made a new one)
Thanks for clarifying Duann, in what version of netfabb are these features included? Custom supports in general seems to be only a premium version. Is the one specific for formlabs available in the standard version?
This paper is based on the design and fabrication of a 3D scanner that uses low-cost hardware and open-source software where the cost of hardware is reduced significantly using wood as construction material and eliminating the need for an IR sensor which is used to capture the dimensions of the objects which is done by netfabb in this scanner and making the application of this scanner limited to small objects. The hardware is controlled using Arduino UNO ATmega328p microcontroller and using Open-source free software like 3D zephyr for 2D to 3D model generation, Netfabb for scaling, MeshLab for clean-up and alignment and GOM inspect to compare the generated scans with professional scans and their respective CAD models.
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