Piezo + FFC Extruder Head Cable PCB by pyr0ball

Last crawled date: 3 years ago

##Rev.E is incoming!
I've started over from scratch and built my own electrical design from the ground up. The new project can be found here
The new version has an onboard microcontroller to auto-calibrate on the fly, and a much more stable circuit with better filtering to prevent false positives.
I'll be posting it in it's own listing, as Rev.E is less universal, and more geared to "Mendel" style Cartesian printers like the i3 clones. The Rev.E print head board has only one change at this time which is using actual 0402 footprints and some better silkscreening as a result.
The Rev.D board for the print head is still compatible with the Rev.E Control/X-Car board chain as well. I'm sure eventually I'll figure out a more intuitive way of naming all of these boards eventually.
In future I may add circuitry for alternate temperature sensors. Let me know what you think about adding an RTD PT100 circuit or a thermocouple amp
~Edit 12/15/2017: The 5v voltage regulators on the BOM are not capable of handling +24v input. I'm currently seeking out replacements that will work at higher ratings. I'll update the BOM with the correct size of resistors and caps at the same time.~
BOM has been updated with higher rated components and passives using the proper 0805 footprints
Cus we all know how much fun soldering grains of sand is right? RIGHT?
Rev.D Has been added!
Changes - 1/30/2018:
Changed footprint spacing on connectors to allow for use of standard JST enclosed headers
Moved fan voltage regulator supply to the control board side of the chain
Replaced voltage regulators with a single LM317 @1.5A. Voltage selection is now handled via changing the vref_adj.
Replaced PZ20 circuit's LDO with a simpler model with higher input voltage range
Added second LDO for dedicated supply to LED's
Isolated TH1 from ground plane to address vdroop effecting thermal readings
Added grounding vias for edges and isolated areas of ground plane
Added decoupling capacitors to power inputs
Added "personal touch" graphic
Rev.C has been added!
This design revision includes three improvements:
Fixed the hole size for the fan and sensor headers, and gave them a little more space
Attempted to clean up and add better labeling
Added a set of solderable pads on the edge of the board for pulling Vcc/12v/5v as needed for extra goodies on your print head
This is a concept board design that handles several different things to make managing your extruder head easier.
Features:
Precision Piezo Circuit built-in for z-probing. (Big thanks to precisionpiezo.co.uk for making their schematics available to the public!)
On-board Voltage Regulators allow the user to select either 5V or 12V fans, even when their printer is using 24V (cus aren't 24v fans just so much harder to find?)
LED feedback of each component, including heaters, fans, and touch sense
Uses a 24-pin 1mm pitch Flat Flexible Cable for routing between the print head and the control board, allowing for great flexibility and a very clean cable system
Included files are the original cad files designed in PCBWeb Available online for free, an up-to-date BOM using Digikey parts, and Gerber file exports formatted for Seeed Studio Fusion PCB
Please let me know if you have any feedback, or would prefer a different pinout. If you have other feature suggestions, I'd be happy to integrate them!
Update 11/27/2017
I've designed and uploaded a modified X-Carriage that should allow almost complete compatibility with most of the open source print heads out there that are designed for the Prusa/Anet style of printer. The Piezo disk sits in between the print head an the X-Carriage, and is flexed along the Y-axis when the nozzle touches the bed.