16T to 20T pulleys

Adding Go Faster Stripes to your 3D Printer
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Loupy31
Posts: 6
Joined: Wed Feb 07, 2018 12:55 am

16T to 20T pulleys

Post: # 617Post Loupy31
Thu Mar 01, 2018 12:04 pm

Hi Guys , i am converting my a8 from 16 tooth to 20 tooth pulleys, do i have to alter the firmware, and if so, can someone explain how i do that please

Peter



ModMike
Posts: 26
Joined: Thu Feb 08, 2018 3:07 pm

Re: 16T to 20T pulleys

Post: # 624Post ModMike
Fri Mar 02, 2018 5:11 am

The first thing you need to do is calculate your theoretical steps per mm. Go the Prusa calculator:

https://www.prusaprinters.org/calculator/

Scroll down until you see belt driven systems. I specified a 20 tooth pulley and got an 80 steps/mm recommendation.

Now edit the Marlin configuration.h file. Look for the following line in the MOTION section:

#define DEFAULT_AXIS_STEPS_PER_UNIT {78.7402,78.7402,200*8/3,760*1.1

The 4 values set the axis steps per unit of the x, y, and z axes, and the extruder. I am going to guess you are playing with the X or Y axis so it’s one of the first 2 values.

Once you flashed the firmware, you will need to calibrate the axis by using the control software of your choice.

This is a good reference:

http://reprap.org/wiki/Calibration

If you find that a bit heavy do a search under 3D printer calibration and you will get a slew of guides to choose from.

By the way, why did you decide to change from a 16 to 20 tooth pulley?

Loupy31
Posts: 6
Joined: Wed Feb 07, 2018 12:55 am

Re: 16T to 20T pulleys

Post: # 628Post Loupy31
Fri Mar 02, 2018 1:39 pm

Hi, Thx for your reply,

the belt is not flexible enough to take out the backlash, has to do a farly tight bend, so i figured go 20T, higher radius should make it easier to adjust, well thats the current working theory

Peter

User avatar
kckndrgn
Posts: 44
Joined: Tue Feb 06, 2018 12:01 am

Re: 16T to 20T pulleys

Post: # 700Post kckndrgn
Sat Mar 03, 2018 5:09 pm

What belt are you using? If it's the stock Anet belt, it's junk. Get a replacement GT2 from Amazon, GearBest, or someplace else. Generally you'll have to order enough for 2 printers, but that's OK, it's gives you some spares.

And just to confirm, you are talking about replacing the pulleys on the motors and not the idlers right?
Printing on 2 Anet A8 printers. One from SainSmart another purchased used.

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