January 10, 2020
Description
This Hemera mount is compatible with the Prusa MK3s X-Carriage.
A lot of mods require a "downgrade" to MK3. You will need to reverse two of the screws that connect the X-carriage and the Hemera mount.
Use the modded fan shroud and PINDA holder by ali_g
https://www.thingiverse.com/thing:4076234
and do the firmware changes according to ali_g's mod:
Change LANG_MODE to 0
Change #define X_PROBE_OFFSET_FROM_EXTRUDER 23 to 26
Change Y_PROBE_OFFSET_FROM_EXTRUDER 5 to -33.8
How to change the firmware:
https://e3d-online.dozuki.com/Guide/Prusa+i3+MK3+Firmware+Modifications/141?lang=en
oh yeah, compiling this firmware is not as easy as described there. It might not work on windows and new macOS machines out of the box. (I used an old rusty iMac in the end.)
Don't forget to adjust the e steps. Type this in your printer terminal:
M92 E786.5 // sets your extruder to 786.5 steps/mm
M500 // save settings
what doesn't work
filament sensor (you have to disable it in the lcd screen menu), unless you add ali_g's modded filament sensor
Version 1.2
This version is the lazy wo/man's method. It only contains the adapter plate for the X carriage, so you don't have to mess with the Z axis. The max available X distance for this mod is 236mm. Meaning, you will loose 14mm of printspace in the X direction.
Version 2.0
This version supports printing on the whole printing area of X = 250mm by Y = 210. However you will not have the full 255 mm movement of the original extruder. This mod requires to swap the right hand Z axis pieces and the X idler part. Read more about it in this forum post:
https://forum.prusaprinters.org/forum/original-prusa-i3-mk3s-mk3-user-mods-octoprint-enclosures-nozzles-.../hemera-mk3s-upgrade-parts-and-firmware/paged/2/#post-186343
I had to sand down the screw on the 3rd picture by ca 1mm so the X-carriage does not crash into it.
Design files available.
Compiled firmware included
Version 3.8.1 for Prusa MK3s
I added the modified and compiled firmware as .hex file, since i ran into so much trouble compiling it. I used the Firmware Updater on Octoprint to flash it.
The firmware is under GNU GPL licence. Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm.
https://prusa3d.github.io/Prusa-Firmware-Doc/
https://github.com/prusa3d/Prusa-Firmware
License:
Creative Commons - Attribution - Share Alike
dima_leigr
