Duet maximum achievable step rates

[dc42]

FWIW I've further increased the maximum available step rate post 3.3beta1 on most boards (all except the Maestro, Tool Board and 1XD). I've already put one of the new figures in the step rates spreadsheet. Step rates in 3.3beta1 are already better than in 3.2.2 for the Tool Board and the 1XD. However, some of the increase may be lost when input shaping is fully implemented.

[JoergS5]

@dc42 for the brave of us (I mean it ) , making it configurable through some parameter would be nice. Otherwise many thanks for the continuous improvements.

[dc42]

@JoergS5 said in Duet maximum achievable step rates:

@dc42 for the brave of us (I mean it ) , making it configurable through some parameter would be nice. Otherwise many thanks for the continuous improvements.

Making what configurable?

[JoergS5]

@dc42 I mean the interrupt rate. But don't waste time, I can do it myself by recompiling the firmware. Only if others have the need, it would be interesting.

[A Former User]

@deckingman said in Duet maximum achievable step rates:

@zapta said in Duet maximum achievable step rates:

@JoergS5 said in Duet maximum achievable step rates:

........................ Anyway, optimizing/prioritizing the hardware/software design for one niche use case like this proportional color mixing can make it sub optimal for the rest of the users. ..................

Woah, hold on a minute. Are you seriously suggesting that increasing the maximum step pulse frequency is a), only beneficial to users of mixing hot ends, and b) a sub optimal thing to do for all other users?

Setting aside the other use cases for higher micro-stepping such as users with very small nozzle and/or layers heights or users with 0.9 degree motors or more recently 0.45 degree motors, possibly in conjunction with fine lead screws, how can having a lower maximum step pulse frequency be beneficial (or "more optimal") for other users?

All 0.45° motors (nema16-18) I got quotes for are "way north from" ca. 100euros, if they are marked "Don´t use for new design" they are slightly cheaper - maybe a little below 100 (oh and min quantitiy is 5 or even 10...), but maybe that is just me having not found the right place to ask or something like it (I only know of ec-mot... and lin-enginee... (sorry for obfuscating the companynames but I do not want to get banned from the forum) to have those)... So I guess as long as not some company rolls the market new, I personally will stick to quality 0.9°-steppers with higher gearing ratio (currently in my personal calculations cheaper). If anybody does know of a cheaper source for 0,45°-steppers please share!

That said I am also in favour for higher-step-rates
+1
but out of a total diffrent usecase: High-speed-printing (single-extruder-single-colour, e.g. e3d-(super-)volcano or maybe one day the newer slice-engineering-mosquito-magnum(+)) for lots of lots of series production parts...

This post maybe a bit off, but I hope you do not mind - after all it is a public forum... ah and thanks for your hint above in your answer! I think you have a really cool use-case with your printer

[Luke'sLaboratory]

@dc42 said in Duet maximum achievable step rates:

Sounds like a net positive to me!

[gaweyo]

@Luke-sLaboratory said in Duet maximum achievable step rates:

I run toolboards (not the 1LC, but inspired by) over CAN with klipper

thanks for bringing this up, looks very interesting!

[A Former User]

@dc42

Hi duet-team,

I am interested in a build of a bigger core-xy (450x450) with either the duet3-mini oder duet3-6hc. The build is optimisted for very-low-moving-mass for very high accel/jerk vals. Are you still updating the values for the alpha 3.3 for those 2 boards here when released in that chart?

Best regards

[dc42]

Good point, we need to measure them all again for 3.3.

[A Former User]

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