Extruder wont extrude Hitop 3DP12

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brianmix
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Re: Extruder wont extrude Hitop 3DP12

Post by brianmix » January 2nd, 2019, 9:57 pm

Yep your correct. Great eyes you have. Nozel was jammed with plastic I think the Teflon tube was installed upside down.
I have a new heater but it wont heat. Had to wire up to my connector. Are the extruder heater or temp sensor polarized. + or - I see no markings?

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Roberts_Clif
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Re: Extruder wont extrude Hitop 3DP12

Post by Roberts_Clif » January 3rd, 2019, 7:16 am

No!

The Heater is a simple 40 watt wire wound power resistor load/heater.
The Thermister is a simple resistor whose resistance is reduced by heating.
Electronics Technician / Computer Programmer

brianmix
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Re: Extruder wont extrude Hitop 3DP12

Post by brianmix » January 4th, 2019, 11:03 pm

Success. Finally after 3 new stepper motors and 2 new heaters a "good" part!
GoodOne_9027.jpg

brianmix
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Re: Extruder wont extrude Hitop 3DP12

Post by brianmix » January 4th, 2019, 11:33 pm

Spoke too soon. on my third part another heater died. It has 24V going to it, just cold. Is this normal?

GrueMaster
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Re: Extruder wont extrude Hitop 3DP12

Post by GrueMaster » January 5th, 2019, 3:06 am

Are you buying 24V rated heaters? That could explain why you are burning through so many.

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Roberts_Clif
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Re: Extruder wont extrude Hitop 3DP12

Post by Roberts_Clif » January 5th, 2019, 7:56 am

Measure the resistance of one of the heaters.

12volt heater
40wt / 12v = 3.333amps : 12v / 3.33amps = 3.6ohms

24volt heater
40wt / 24v = 1.667amps : 24v / 1.667amps = 14.4ohms

A 12 volt heater will have about 3.6 ohms
A 24 volt heater will have about 14.4 ohms

Resistances will vary with manufactures as I have seen many 40 watts heaters delivering only 38 watts.
The reason is some manufactures trying to save money use a standard 15 ohm heater which will deliver only 38.4 watts.

I have purchased many 12V heaters and received 24 volt heaters and vice versa, it could be merely sellers sending wrong parts.
I now check every part I purchase and label them, as to nozzle heaters the actual resistance is written then they at placed in stock.
The resistances I have logged suggests the Heaters I have purchased are made with Resistors in the 5% Tolerance range.
Electronics Technician / Computer Programmer

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