Qidi I-Fast Upgrade to Klipper BTT and solve HW issues + BLTouch Holder

*** Be aware that there is no way back, takes time and money - consider buying new printer first. But I'm happy now and that what counts ***

*** 

Discord to exchange knowledge and ideas as we keep improving IFast

— https://discord.gg/VRfdQc8PVQ  —

(old link *** https://discord.gg/MQXRUpbvqW *** )

***

I-Fast in original version was not satisfying. The first batch was a tragedy!

One must to do is a BLTouch with front holder which brings the issue that motherboard has to be exchanged.

See my base shopping list:

and then there was a lot of small stuff and some handwork to make it up-to-date:
 

You can spot some of the improvements with *

• custom extruder
• BL Touch
• ADXL
• XY cable guide
• reinforcement of gantry (later version of iFast got it…Z unstable on temp change)
• acitve filter
• extra light
• extra fans for all steppers
• Qidi 4 Plus chamber heater

Which brings us some more wiring:
 

Tips / Troubleshooter:
 

• at some point there were to less FAN controllers  → use solid state relais and control them with CM outputs

• for a real chamber heater:

• I did use a hard wiring (serial would be nice to try if it can handle 2ext?). I suggest to keep the flat cable to avoid remodeling extruders as I did later:
  • frist I used spare PCB from extra (low temp) extruder on MB side:
    
  • 2nd option is to buy PCB from AliExpress to pin out
    https://a.aliexpress.com/_EJlWepK 
  •