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I know that CoreXY kinematics is very complex and hard to calculate for the firmware making it better to use a 32-bit board. For some reason, I can't use any 32-bit board. What problems will occur if I use an 8-bit board like Arduino Mega with a CoreXY 3D printer?

Everything that I wrote in this question about hard kinematic calculations was referenced from this video, HyperCube 3D Printer 8-Bit Speed Wall, by Tech2c (the designer and builder of hypercube). After watching the video I doubted using an 8-bit board.

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  • $\begingroup$ How is corexy hard to calculate? Motor motions should just be sum/difference. Delta on the other hand has nontrivial math. $\endgroup$
    – R.. GitHub STOP HELPING ICE
    Commented Aug 5, 2020 at 13:26
  • $\begingroup$ @R..GitHubSTOPHELPINGICE Tech2c (designer of hypercube) says in his video $\endgroup$
    – Mahan Lamee
    Commented Aug 5, 2020 at 14:24
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    $\begingroup$ I'm not convinced at his explanation for the problem. There are a lot of print quality problems in that video. $\endgroup$
    – R.. GitHub STOP HELPING ICE
    Commented Aug 5, 2020 at 15:10
  • $\begingroup$ Just my 2 cents; that 8-bit board is a dead-end for you. Find a 32-bit solution you like, and keep pushing those boundaries. $\endgroup$
    – user77232
    Commented Aug 6, 2020 at 14:55

2 Answers 2

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CoreXY should not require calculations which can slow down a board. Also, a normal Marlin becomes CPU limited often before 100 mm/s on 8 bit boards due to arc interpolation and other processing.

However, if you use Klipper which runs on a Raspberry Pi, 8 bit boards are rarely a limiting factor. I could print at 100 mm/s on mine with only 30% CPU utilisation and without slowdowns of any kind.

See

and

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  • $\begingroup$ what about marlin 2? $\endgroup$
    – Mahan Lamee
    Commented Aug 5, 2020 at 15:28
  • $\begingroup$ @MahanLameie I doubt it will be more cpu efficient than Marlin 1. I don't remember "speed" being one of the improvements. $\endgroup$
    – FarO
    Commented Aug 5, 2020 at 15:31
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You can use an 8-bit controller board for a CoreXY kinematics 3D printer. The calculations are not so complicated opposed to those for a Delta.

My Hypercube Evolution uses a RUMBA controller board that hasn't failed me past years.

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  • $\begingroup$ I also want to build a modified hypercube but after watching this video by Tech2c (inventor of hypercube), I doubted using an 8-bit board. $\endgroup$
    – Mahan Lamee
    Commented Aug 5, 2020 at 13:38

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