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Re: Hot end on Prusa_Mendel i2 not heating up any more. Thermistor OK AFAIK - 9 years ago

Test results: Step 1: +12 V OK (I had switched the leads on the DMM yesterday, fool that I am. No wonder the conductivity tests were inconclusive yesterday!) Step 2: +12 V OK Step 3: +12 V OK Step 4: 0 V OK Step 5: - 5,44 V KO, LED4 on (negative voltage, what does that tell you? I found no 20 in the pic above. But you may have meant the 20 of the I2C on the PCB upper right corner?) No fan

by GeeBee - Reprappers

Re: Hot end on Prusa_Mendel i2 not heating up any more. Thermistor OK AFAIK - 9 years ago

Wow! Mindrealm, that is quite a manual you sent me there. I appreciate that very much and will be doing all or most of that right away. My terminal D9 (or 3,4 as your pic goes) is empty by the way. The 3 MOS-FETs read thus: P55NF06 7SABK VW PHL 311 ST e3 Write you later. GeeBee

by GeeBee - Reprappers

Re: Unklarer Elektronik-Defekt: hotendtemperatur konstant 0°C nach 357°C - 9 years ago

Ach ja, morgen werde ich hoffentlich eine neue Basis zum Draufschrauben des Geräts haben (3 oder 4cm Multiplex oder Tischlerplatte sollten wohl steif genug sein, oder?), dann werde ich wohl auch die Elektronikbox anpacken und mal Klarschiff machen mit dem Heißklebergewusel darin. Gute Nacht, bis nach Acht GeeBee

by GeeBee - Allgemeines

Re: Unklarer Elektronik-Defekt: hotendtemperatur konstant 0°C nach 357°C - 9 years ago

Hallo und Guten Abend Euch allen und vor Allen anderen meinen Helfern Heute habe ich mein Hot End weiter zerlegt, was mir nicht leichtfiel, da ich auch jetzt nicht wusste, was ich falsch machen könnte und Kaptonband habe ich z.B. keines. Auch so eine Kleinigkeit wie ein Kurzer am Übergang vom Thermistor zu den Lötfahnen durch Berührung des Aluquaders am Hot End beim Umwickeln trotz der Isoschlä

by GeeBee - Allgemeines

Re: Hot end on Prusa_Mendel i2 not heating up any more. Thermistor OK AFAIK - 9 years ago

Hello back everybody, when I did not get answers right away I restlessly decided to eliminate my personal causes not being electrically fit for Arduino and RAMPS and all that semiconduction. I measured a resistance of somewhere around 100 KOhms (fluctuating by +-5 KOhms, which may have been caused by a weak battery in my DMM, as I think today, when more peculiar measurements and loss of conduct

by GeeBee - Reprappers

Re: Unklarer Elektronik-Defekt: hotendtemperatur konstant 0°C nach 357°C - 9 years ago

Danke Traumflug, für Deine Antwort, dazu eine Nachfrage: Um die Spannung am Arduino-pin zu steigern, müsste ich ja wohl den Thermistor erwärmen, damit nicht so viel Spg. an ihm abfällt. korrekt? Da muss ich wohl nun die Box, in der man mir die Platinen-Kombo mit Heißkleber montiert hatte (:O), "aufschweißen". Nun ja, ich starte mal: 1. Thermistor-Leads bei T0 identifiziert. Kabel scheint OK,

by GeeBee - Allgemeines

Re: Hot end on Prusa_Mendel i2 not heating up any more. Thermistor OK AFAIK - 9 years ago

Yes, waitiki, thanks for the hint to ergonomy. Of course I know that it is seen from the back here and I hate using it thus, only when it came attached to the desk that was the way to cram it in my little space. Now I have lost my fear of discomforting it and my belief in some of the seller's statements upon handover about "Never touch ..."(not applicable here obviously) and others I will change

by GeeBee - Reprappers

Re: Large Custom Swedish Plotter Machine HELP NEEDED - 9 years ago

I can not believe it, Ficus, am I reading wrong or is that a DOS operated PC still working though the folks seem to have forgotten the name of the batch file or application to start for the engraver? Attention: Dust might have accumulated in the power supply or even the case by other entries, so that the PC might suffocate from heat soon. So if it is some version of DOS it says so when you type

by GeeBee - General

Unklarer Elektronik-Defekt: hotendtemperatur konstant 0°C nach 357°C - 9 years ago

Hallo da draußen! Ich bin seit ca. 1 Monat in Sachen 3D-Druck hier unterwegs und habe seit 2 Wochen einen (gebrauchten) Prusa Mendel it. 2, den ich in betrieb nehme, nachdem ich mir eigtl. einen selber hatte löten und bauen wollen, aber auf halbem Wege dann meine Teile, die fertig gelötete RAMPS 1.4 und Geld gegen einen gebrauchten Fertigen tauschte. ich dachte, dann bin ih schneller am Ziel und

by GeeBee - Allgemeines

Hot end on Prusa_Mendel i2 not heating up any more. Thermistor OK AFAIK - 9 years ago

Hello everybody I have been getting acquainted with my pre-used (is it a Prusa-Mendel i2?) for a week or so now. I have not printed a single item yet though Cura drew a bad bed-calibration rectangle (should that have been a square?). I was prepared to have a lot of learning todo, wanted to build my Prusa or any printer myself and soldered a RAMPS 1.3 board but when that was done I got offered a

by GeeBee - Reprappers

3d printer with assembly of printhead, extruder etc. actuated by wire instead of cogwheels, delta arms? - 9 years ago

My newbie question after seeing about a dozen commercial and DIY designs and not knowing how or where to search best: Is there a 3d printer with the assembly of printhead, extruder etc. actuated by wire? Or are cogwheels/cograils/belts and arms as with the delta devices the nonplus? Thanks for your info. Have a merry Xmas everybody!

by GeeBee - General