Duet: What is max rpm that a 0.9 stepper can Reliably turn? Creating a geared extruder design. I need to make sure I don't over gear. What is the max RPM the Duet can drive a 0.9 degree stepper without missing steps? Probably a question for dc42......... https://reprap.org/forum/read.php?13,588077,588077#msg-588077 Sun, 17 May 2026 11:54:27 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?13,588077,589278#msg-589278 Re: Duet: What is max rpm that a 0.9 stepper can Reliably turn? https://reprap.org/forum/read.php?13,588077,589278#msg-589278 IMHO it can be helpful against skipping and stripping filament, when the extruder motion is as smooth as possible.
At least, I found a better print quality, when I changed the driver of my 1.8° extruder from 1/16 stepsticks to decay hacked 1/32 DRV8825.
I assume it will be even better with 0.9° at 1/16 steps.
-Olaf]]> o_lampe Controllers Thu, 26 Nov 2015 06:19:48 -0500 https://reprap.org/forum/read.php?13,588077,588285#msg-588285 Re: Duet: What is max rpm that a 0.9 stepper can Reliably turn? https://reprap.org/forum/read.php?13,588077,588285#msg-588285
For a volcano 1mm nozzle, let's assume you use 0.5mm layer height and 1.2mm extrusion width. To print at 100mm/sec you need to extrude about 0.5 * 1.2 * 100 = 60mm^3 per second. Divide that by pi * (1.75/2)^2 and I get 25mm/sec.]]> dc42 Controllers Tue, 24 Nov 2015 05:19:46 -0500 https://reprap.org/forum/read.php?13,588077,588191#msg-588191 Re: Duet: What is max rpm that a 0.9 stepper can Reliably turn? https://reprap.org/forum/read.php?13,588077,588191#msg-588191
Does anyone have information on the maximum speed of 1.75mm filament into E3D regular and volcano nozzles?????]]> patrickrio Controllers Mon, 23 Nov 2015 19:26:24 -0500 https://reprap.org/forum/read.php?13,588077,588173#msg-588173 Re: Duet: What is max rpm that a 0.9 stepper can Reliably turn? https://reprap.org/forum/read.php?13,588077,588173#msg-588173
Quote
patrickrio
As a side note, I will be using the duet on my new mini delta printer too. I know that the 3 motion steppers in the delta take more steps also (0.9 steppers here too...). How hard will it be to run into step speed limitations with the duet?

Max travel speed on my delta using RRF 1.09k-dc42 and 160 microsteps/mm is about 300mm/sec. If you have 16 tooth pulleys instead of the 20-tooth that I have, then your steps/mm will be 200 so your max speed will be about 20% lower.]]> dc42 Controllers Mon, 23 Nov 2015 17:57:28 -0500 https://reprap.org/forum/read.php?13,588077,588165#msg-588165 Re: Duet: What is max rpm that a 0.9 stepper can Reliably turn? https://reprap.org/forum/read.php?13,588077,588165#msg-588165
As examples, how fast can you send filament into a normal e3d and a volcano in mm/sec for 1.75mm filament? This would be how much filament must be moved with 50kHz. Then you would just make sure your path width, height and speed mean extruding less than the maximum...... I think the max speed of the volcano is 40mm/sec of 1.75 filament?????

As a side note, I will be using the duet on my new mini delta printer too. I know that the 3 motion steppers in the delta take more steps also (0.9 steppers here too...). How hard will it be to run into step speed limitations with the duet?]]> patrickrio Controllers Mon, 23 Nov 2015 17:39:42 -0500 https://reprap.org/forum/read.php?13,588077,588095#msg-588095 Re: Duet: What is max rpm that a 0.9 stepper can Reliably turn? https://reprap.org/forum/read.php?13,588077,588095#msg-588095
The Duet running RepRapFirmware 1.09k-dc42 can achieve 100kHz step rate, but I suggest you keep the max step rate no more than 50kHz to avoid overloading the processor. If you want to achieve 100mm/sec extruder speed, that means keeping the microsteps/mm below 500.]]> dc42 Controllers Mon, 23 Nov 2015 15:00:03 -0500 https://reprap.org/forum/read.php?13,588077,588077#msg-588077 Duet: What is max rpm that a 0.9 stepper can Reliably turn? https://reprap.org/forum/read.php?13,588077,588077#msg-588077
Probably a question for dc42.........]]> patrickrio Controllers Mon, 23 Nov 2015 14:24:18 -0500