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Print PEI: MK4 High Temp 450 °C mod is here!  

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jan.d.slay
(@jan-d-slay)
Reputable Member
RE: Print PEI: MK4 High Temp 450 °C mod is here!

 

Posted by: @caroline

Thank you SO MUCH, this is brilliant!

Any chance on also implementing these changes to the Prusa XL?

Could you please share your insights on what you think might be different compared to the Core One?

Right now, my Prusa Core One HT project—which features active chamber heating and water cooling—is taking up a lot of my time.

I can't say yet whether it will work properly on the Prusa XL.

However, there are users who claim to have succeeded.

Mods for Core One: Core One HT 450 degrees, Comfortable display , Very fast print start and Reducing noises
Mods for Prusa XL: Very fast print start

Posted : 23/04/2026 4:44 pm
jan.d.slay
(@jan-d-slay)
Reputable Member
RE: Print PEI: MK4 High Temp 450 °C mod is here!

If there are any other “crazy” and “adventurous” people out there who want to test the firmware, I've now had the HT modifications applied to firmware version 6.4.0 as well.

This time, the AI system Claude came out on top, and Chat GPT unfortunately failed.

https://www.printables.com/model/1638476-prusa-core-one-hightemp-450-modification-for-britt

https://github.com/jandslay/Prusa-Firmware-Buddy-Core-One-HT450

Of course, I can't guarantee that the new firmware will work without any issues. Unfortunately, I haven't been able to test it myself yet—the Core One is currently lying disassembled in front of me 🙂

Mods for Core One: Core One HT 450 degrees, Comfortable display , Very fast print start and Reducing noises
Mods for Prusa XL: Very fast print start

Posted : 24/04/2026 6:15 pm
Fil4ment
(@fil4ment)
Trusted Member
RE: Print PEI: MK4 High Temp 450 °C mod is here!

I'm really hoping that Prusa will integrate this or something like it, and support the HT hotend for the Mk4S as well, instead of just the Core One.

Posted : 24/04/2026 11:40 pm
1 people liked
Ruebarb
(@ruebarb)
Estimable Member
RE:

Did you edit any other files or entries beyond these in configuration_coreone.h? Github indicated more than that was changed, but I didn't find the changes.

#define HEATER_0_MAXTEMP 465

#define TEMP_SENSOR_0 1010

Core One L MMU3, MK3S

Posted : 02/05/2026 7:21 pm
1 people liked
cwbullet
(@cwbullet)
Member
RE: Print PEI: MK4 High Temp 450 °C mod is here!

I hope Pruse incorporates this.  

--------------------
Chuck H
3D Printer Review Blog

Posted : 02/05/2026 9:42 pm
jan.d.slay
(@jan-d-slay)
Reputable Member
RE: Print PEI: MK4 High Temp 450 °C mod is here!

 

Posted by: @ruebarb

Did you edit any other files or entries beyond these in configuration_coreone.h? Github indicated more than that was changed, but I didn't find the changes.

#define HEATER_0_MAXTEMP 465

#define TEMP_SENSOR_0 1010

The easiest way would be to use this link:

https://github.com/jandslay/Prusa-Firmware-Buddy-Core-One-HT450/compare/v6.4.0...coreone-6.4.0-pt1000-450

You need to select "master" at the top.

Mods for Core One: Core One HT 450 degrees, Comfortable display , Very fast print start and Reducing noises
Mods for Prusa XL: Very fast print start

Posted : 03/05/2026 6:16 am
1 people liked
Ruebarb
(@ruebarb)
Estimable Member
RE: Print PEI: MK4 High Temp 450 °C mod is here!

Thank you, that shows everything very clearly.

Core One L MMU3, MK3S

Posted : 03/05/2026 1:31 pm
1 people liked
jan.d.slay
(@jan-d-slay)
Reputable Member
RE: Print PEI: MK4 High Temp 450 °C mod is here!

Just to remind you, the AI chatbots ChatGPT and Claude were helpful.

I just told them what I wanted and whether it worked.

Mods for Core One: Core One HT 450 degrees, Comfortable display , Very fast print start and Reducing noises
Mods for Prusa XL: Very fast print start

Posted : 03/05/2026 4:46 pm
1 people liked
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