Prusa Core One HT – Finally, it's done!  

RE: Prusa Core One HT – Finally, it's done!

That's exactly what I purchased, but the thermistor sticks up a bit much.  I'm going to drill it out a bit, but may still not have enough room.  

If the thermistor probe is exposed outside the block, I would assume that would cause issues.  Would running a pid tune allow for enough adjustment?

RE: Prusa Core One HT – Finally, it's done!

Posted by: @john-weaver

That's exactly what I purchased, but the thermistor sticks up a bit much.  I'm going to drill it out a bit, but may still not have enough room.  

If the thermistor probe is exposed outside the block, I would assume that would cause issues.  Would running a pid tune allow for enough adjustment?

I probably wouldn't worry too much about that since the end of the thermistor is a glass bead that is epoxied into the metal canister. Problem is with the PID tuning. When I tuned my I couldn't go above 250° as the target temperature. Otherwise, the PID routine would bomb out. That might need to be adjusted in the patched firmware. 

RE: Prusa Core One HT – Finally, it's done!

Hi,

I have also a modded Core One+ (and a Core One L) for HT. I managed to get 70+C chamber temps (which is i think more important, than having a 400C nozzle).

Without an active heater. It takes around 40 minutes to get from room temeprature to 60C and maybe another 10-15 minutes to 70C.

I used car insulation for the inside of the printer (most of the heat gets out through the top) and a thick blanket over the top of the printer.

Its great to see, that i am not alone with getting crazy into technical filaments and hi-temp printers 🙂

RE: Prusa Core One HT – Finally, it's done!

I’m currently also working on a chamber heater, but this one is active. After the initial tests, I’ve come to the conclusion that the firmware itself is capable of handling the control if it’s configured accordingly. Unfortunately, in my opinion, the sensor system is the reason why I still have to rely on an Arduino or an ESP32 to do the job.

Good insulation is actually—what a surprise—important. The metal inside the printer absorbs a lot of energy during the heating phase, and it takes too long to reach the desired temperature.

My old setup works like this: the two fans on the housing force air through two PTC heaters. They receive a PWM signal from the xBubby board. The chamber temperature control was rewritten in the firmware.

The new setup aims to incorporate more safety features and more sensors. After all, we’re dealing with electrical current that generates heat.

Incidentally, I could also integrate the water cooling, which is currently controlled via the Prusa firmware using a single sensor and a fan that receives the signal from the heatsink fan.

RE: Prusa Core One HT – Finally, it's done!

I used car insulation for the inside of the printer (most of the heat gets out through the top) and a thick blanket over the top of the printer.

I think it's great that you've already come so far and are actively using it—genal.

Could you show me what kind of special insulation you used?

I'd really appreciate a few pictures