Hi guys, I started with a Sunhokey acrylic framed i3 clone and it had X and Y step values of 80.5 to get the required scale in the printouts. I have just completed a rework using Emotiontech's prusa i3 rework V1.5 and now to be able to get correct scale in my printouts, I needed to reduce my X and y step values to around 75. I'm interested to know why I needed to do this. My pulleys, stepper motors and belt pitch has not chnaged (although I did replace the belts) so the mathematical equation to arrive at the step values still holds true, but I am required to have lesser values otherwise my prints come out bigger than they should be. I have my scale correct now but am interested in why my end step values don't reflect the calculation based on the hardware used. Should I worry about it? Cheers, Steve https://reprap.org/forum/read.php?406,706128,706128#msg-706128 Tue, 15 Sep 2026 23:36:13 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?406,706128,706318#msg-706318 https://reprap.org/forum/read.php?406,706128,706318#msg-706318
After thinking it through, the smaller idler bearing should not effect the step value. Are you using different pulleys (teeth count the same)?

A bit of a stumper...]]> psneddon Prusa i3 and variants Fri, 09 Sep 2016 12:36:48 -0400 https://reprap.org/forum/read.php?406,706128,706232#msg-706232 https://reprap.org/forum/read.php?406,706128,706232#msg-706232
I did replace the belts under the rebuild.

Cheers,

Steve]]> stevo1957 Prusa i3 and variants Fri, 09 Sep 2016 06:44:57 -0400 https://reprap.org/forum/read.php?406,706128,706210#msg-706210 https://reprap.org/forum/read.php?406,706128,706210#msg-706210 Dust Prusa i3 and variants Fri, 09 Sep 2016 05:22:00 -0400 https://reprap.org/forum/read.php?406,706128,706190#msg-706190 https://reprap.org/forum/read.php?406,706128,706190#msg-706190
Same hardware in a different frame, and I need to reduce X and Y steps to get the scaling right.

Cheers,

Steve]]> stevo1957 Prusa i3 and variants Fri, 09 Sep 2016 03:43:00 -0400 https://reprap.org/forum/read.php?406,706128,706147#msg-706147 https://reprap.org/forum/read.php?406,706128,706147#msg-706147 For example, step angle might be reported being 1.8°, but step accuracy is +/- 5%
So the real step angle is something between 1.71 - 1.89°

I'm guessing your real step angle is above 1.8°, so you need less steps/mm]]> Veesta Prusa i3 and variants Thu, 08 Sep 2016 18:23:03 -0400 https://reprap.org/forum/read.php?406,706128,706128#msg-706128 https://reprap.org/forum/read.php?406,706128,706128#msg-706128
I started with a Sunhokey acrylic framed i3 clone and it had X and Y step values of 80.5 to get the required scale in the printouts.

I have just completed a rework using Emotiontech's prusa i3 rework V1.5 and now to be able to get correct scale in my printouts, I needed to reduce my X and y step values to around 75.

I'm interested to know why I needed to do this.

My pulleys, stepper motors and belt pitch has not chnaged (although I did replace the belts) so the mathematical equation to arrive at the step values still holds true, but I am required to have lesser values otherwise my prints come out bigger than they should be.

I have my scale correct now but am interested in why my end step values don't reflect the calculation based on the hardware used.

Should I worry about it?

Cheers,

Steve]]> stevo1957 Prusa i3 and variants Thu, 08 Sep 2016 17:26:56 -0400