As I've been posting here, I have a prusa i3 on loan for a couple of months.
A few weeks ago, I got a piece that had no plastic deposited on one specific area, and was fine on the rest. This was very odd, so I had it reprinted and stayed around to see what happened. Immediately I saw that the extruder stepper motor was not turning. I looked around to try to see the reason for this, and found the culprit: a damaged cable:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiscg7YeLQJLJGlWW3nqrO62iLqqm7yNCUm-0L0y4e7B364goxjXBUzvS1lkogfixHAuCSE5Shmm3ug_8A0IT19yTOzhublpMMHEB68-11cjAtXwcI28LXL1nKcQdNkf-x89WElwAiUqAA/s320/IMG_3218.jpg) |
Extruder stepper broken cable |
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I tried fixing it, by taking out the small metal tab in the connector, but that didn't work for long.
I talked to the owner of the printer and he had a spare cable. According to him this had happened before, and was a common problem.
The issue here is that a lot of stress is put on that particular cable as it travels left and right along the X axis all the time, plus vertically, although that is a slow and much less often travel.
Since I don't like problems that reoccur, I thought of a solution: a cable holder that transfers the stress from the connector to the cable, which is a point much less prone to failure. So I designed a cable holder that holds not only the extruder stepper cable, but all the cable for heating the extruder and for the fans. Here it is, printed in glow-in-the-dark PLA:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEicQQbbQWeQROvqOdxj77Zh3l1dsu_kk-dvOHxTun6-GP2ldv53r2k8YQGso1q-ZT4KN1HLJEdNsRoJeQ0mbFl0Ur1x5tscpxgysP-vV-Y2AzXx3HcKa9TNyZWVNRJbCleVU1GqrMw_JQg/s320/IMG_3396.jpg) |
Extruder stepper cable holder |
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgPQbJ-WRzFeOfwvnV8kW4j3HL-8VDSaYslMvuTagAj6BaWU3ETm611MgxrZjoXpLwbqNTkHyn3NA3GS6DoKvgTCXe3b7_-y3wNMVn3eAUFpqBPN84Yjqxnaa2rUZHuvCSr-rDOZQQy61A/s320/IMG_3395.jpg) |
Extruder stepper cable holder |
This makes the whole cable behave much better, and I think will also prolong the life of the extruder heating connections. I also printed one for the X-axis stepper motor which travels up with the Z-axis:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9hW_XuBUBprh30eyk849s-I5wPB0ERptkOJPFLRlmBiJGyTX6g1Z5vdHPex3r84kOJUUXAGMQ8-KnhhoD4_F3kWUKw-4k-67mhgSBWh8WiRlN3ShOAQw_kr8Hubv0iFBshyphenhyphenDRpeewqJA/s320/IMG_3419.jpg) |
X-axis cable holder |
You can find these models in the
warehouse here.
While discussing this problem, I also realized the cable proving the heated bed with power also keeps traveling back and forth along the y-axis and so it would also fail sooner or later, so I also designed a little holder for this. You can find it in the
warehouse here:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgjH49zaOoN8OYZdaZADSBYBlCOYb6wm2NXwZN0QlfKYi3D-VH8PuAp9Wh_JIybZ9rvEGWxpV9ixSFcq6u8JXm4dO17deL67DOR_aaspG6UWQlt1GCzRkN-bD8ZzR6gnZwEDIOK3WRdCmQ/s320/IMG_3418.jpg) |
Heated bed cable holder |