Extruder only upgrade to Mk2.5
I am happy with the Mk2 heatbed and I don't need the magnetic spring steel PEI sheet. But I'd like to use the new print head features like filament sensor and PINDA temperature compensation. My setup will be:
1. Mk2.5 print head
2. Mk2S headbed, Rambo enclosure,rods and bearings.
Thus I'm thinking about JUST upgrading the extruder to Mk2.5, i.e. order:
* PINDA V2, (with adapter cable selfmade)
* Bondtech gear
* Noctua fan
and printing the black Mk2.5 extruder.
Will I be able to use the latest 3.3.1 firmware (supporing PINDA temperature compensation) with that configuration? Does the firmware have any dependencies on the type of heatbed, i.e. whether Mk2/S and Mk2.5 heatbed is used?
PS: When checking the firmware source code I found there is some logic making sure the steel sheet is removed before PINDA probe temperature calibration. Will that have an impact on firmware operation with a Mk2/S heatbed?
Re: Extruder only upgrade to Mk2.5
Hi, I have the same question, cause I also want to keep my original MK42 heatbed.
I have printed the MK2.5 parts (also the new design) and judging from the manual it should work without a problem.
The new firmware will need the speed signal from the noctua fan and the thermistor from the new pinda probe. As well as the new filament sensor. I only have the noctua fan ordered, because the filament sensor can be deactivated in the firmware. I will try to use the old pinda probe, but, if this will not work, I will have to order the new probe too.
So, the question remains, is there a difference in the firmware or in the physical part of the two heatbeds?
From the open source drawings I can not see any differences. And if the location of the magnetic inserts haven't changed, the firmware process should work without problems.
Re: Extruder only upgrade to Mk2.5
I've recently upgraded my Mk2 to a Mk2S and remixed the extruder to include a PINDA V2, the Noctua fan and the R3 improvements. Details at https://www.thingiverse.com/thing:3062641 . The printer works fine after the upgrade. I had nozzle issues due to an incorrectly mounted PTFE tube (collet was not pulled out) which are resolved by now.
IMHO the Mk2.5/3 3.3.1 firmware will not work on a Mk2S. From what I have seen in the 3.3.1 code it uses different parameters in finding the bed z calibration and a variety of other places. The least concern will be the self-test failing due to missing fan tacho signals and messages about removing the spring steel sheet. Let me know if it works out for you.
The PINDA V2 requires a temperature calibration backport from Mk2.5 3.3.1 into Mk2 3.1.0 which I have started at https://github.com/baloan/Prusa-Firmware . All PINDA V2 related code is marked with a PINDA_THERMISTOR define so the idea is to copy those parts into 3.1.0. I can compile my version but the firmware flash currently fails. See seperate post in firmware for details.
Re: Extruder only upgrade to Mk2.5
I've successfully completed the PINDA V2 backport.
Upgrade instructions and stl things on https://www.thingiverse.com/thing:3062641 .
Mk2/S Firmware with PINDA V2 calibration backport: https://github.com/baloan/Prusa-Firmware
Enclosed my first calibration:
