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.
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Tech Gorilla
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Re: Extruder wont extrude Hitop 3DP12

Post by Tech Gorilla » March 18th, 2019, 3:19 pm

Roberts_Clif wrote:
December 30th, 2018, 10:00 pm
The metal brackets that hold the Z steppers are too thin and allow movement in the smooth rods.
This is curious to me. Is there a file for a part to replace these? What are some of the symptoms of this condition?

Even after bearing change and anti-backlash nuts installed, I am getting very fine variations is the layers. Almost like I am using Curas Fuzzy Skin on a VERY low setting. I will try and take a picture of the result of my latest calibration cube printed in ABS.
IMG_3358[1].JPG
.1 layer height, 80c bed, 240c tip, 30mm/s
Tech Gorilla - Laying down molten plastic since 11/18.

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Roberts_Clif
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Re: Extruder wont extrude Hitop 3DP12

Post by Roberts_Clif » March 18th, 2019, 8:35 pm

When the Smooth rods wobble you will have Z striping on all sides of the Model less top and bottom


Here is my preferred solution
https://www.thingiverse.com/thing:1576639/

https://www.thingiverse.com/ has many Hictop related models to help fix problems and just to make it look good.

The Twins 3DP11 - Red and 3DP12 - Blu

The Twins 2018-3.JPG
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Roberts_Clif
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Re: Extruder wont extrude Hitop 3DP12

Post by Roberts_Clif » March 18th, 2019, 9:07 pm

ABS Gutter clamp designed by myself Printed at Nozzle 228C - Bed 96C at 72% print Speed

Gutter ABS.jpg
Gutter ABS-1.jpg
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