Igor's Blog

I was doing some 3D printing over the weekend and everything was going well until I noticed that the extruder on my Portabee wouldn't heat up any more. At first I thought it was a loose connection so I tried to adjust all the wiring - that didn't help. Since it was already dark and cold outside I decided to leave it. Early Monday morning I managed to get some time in before work to determine what happened. I had a sneaking suspicion that the resistor that's used as a heating element has given out, but what I found really surprised me.

I happened to have a new heating element resistor lying around, so I decided to do some basic checks with a multimeter. It was showing up 7 Ohms (it's rated 6k8 so close enough). The resistor that was inside the extruder showed as infinity, that's what I'd expect from a resistor that stopped working.

IMG_1002.jpg IMG_1003.jpg


Next up I got my infrared thermometer and decided to do one last check of the existing resistor, then I connected the new resistor to the printer's wiring to see if it would work. The existing resistor showed cold still, the new resistor immediately started heating up - it actually got red hot!

IMG_1004.jpg IMG_1005.jpg


So that confirmed it for me - the old resistor had to be replaced.



When I cut one of the pins and pulled out the resistor what I found really surprised me. It was completely shredded! Side by side with the new one it looks like a saw cut it to pieces.

IMG_1006.jpg IMG_1007.jpg


I decided to connect the new resistor with slightly longer leads. The wires I used were from an old PC Molex connector. It turned out quite nice.
IMG_1011.jpg


I wasn't sure if these wires could withstand the high temperatures so I insulated them with some Kapton tape.
IMG_1012.jpg



I added more Kapton tape around the extruder and heated it up for a test. It worked fine! I've had the 3D printer running all day now making quite a large print without any issues so looks like the wiring isn't melting!
IMG_1014.jpg


-i

comments powered by Disqus
Other posts you may like...
Programming, DIY, Games, Hacks, and Tech

Recent Blog Posts

Converting a CSV file containing commas in quotes to a pipe separated file using Awk and Bash

How to get Facybox gallery popup to work for images with dynamic URLs

jQuery UI Photoboxr plugin updated to version 0.2

Learn How to Add Disclaimer to All Outgoing Emails in Office 365

How to securely host your web site for free with Google Cloud and CloudFlare (part 3)

How to securely host your web site for free with Google Cloud and CloudFlare (part 2)

How to securely host your web site for free with Google Cloud and CloudFlare (part 1)

Beware of the subtle difference in date format strings between MySQL and SQLite

Postman reporting Unexpected 'N' error in response body

Adding extra shelves to the Ikea Detolf display cabinet

Recent Galleries

Space Food - Chocolate Ice Cream with Chocolate Chips

Legeod Star Wars AT-DP kit

DIY spare parts computer build with a RAIDMAX Anura case

Fake 'Lepin' brand Lego packaging

Hardwood garden bench with clear resin void filler

Fixing a 3D printer extruder that stopped heating up

Easily increase disk space in a Lenovo Ideapad 100S 14" laptop with an M.2 SSD

Making a multi-piece 3D printed solder spool holder stand

DIY indoor apartment grow light wiring

Good Friday Electronics fun Easter Bunny LED PCB Kit IBEABU-01.0

My Other Web Sites

Igor and Elise's Travels
Riverside Expressway Cam
300 George St Blogumentary

My Online Tools

UUID to OID Converter
Guru JSON-RPC Tester
Extrudifier Object Designer
Travel ┬ÁBlog

Blogs and Friends

Matt Moores Blog
Georgi's FlatPress Guide
Perplexing Permutations
The Security Sleuth
Ilia Rogatchevski
Travelling Fairy

Blog Activity

Blog Activity
Please follow me for more great content!
     
Don't show this again