Hot end concerns Hello, I am trying to finish to mount my RepRapPro. I am at the extruder hot end. I have some questions for people with more experience than me: 1) From the installation instructions, I am concerned that the extruder cable that brings power to the hot end resistor, after a few centimeters of cable and connector, become a PC ribbon flat ! Picture: Hotend connected to ribbon flat - Has really a ribbon flat the capability to support all the power for the hot resistor or it will become hot ? 2) Both terminals of the hot end resistor and thermistore should be crimped with JST stating the instructions. I am not able to ensure a good crimp, since I do not have the correct micro crimp tool for 1.2 mm JST female. Picture: Thermistore Crimped and Resistor not yet Of course I can order one and wait a couple of weeks. - Is it the same, if I fix the cable with solder without crimp, or the hot end high temperature will melt the solder ? This is my first attempt to mount a RepRap printer, and there is no day that I can find a small problem (e.g. no correct screw, screws head to file, shrink with hot air and no gun....), and I solve them patiently. I love it, because it gives more satisfaction once the printer is ended. In this case I do not have idea what could be the correct approach. Any suggetions ? Best Regards https://reprap.org/forum/read.php?1,194329,194329#msg-194329 Mon, 05 Oct 2026 19:55:39 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,194329,194396#msg-194396 Re: Hot end concerns https://reprap.org/forum/read.php?1,194329,194396#msg-194396
Quote

Definitely get a pair of the speciality crimpers. If you do them with needle nose pliers, they will eventually loosen and disconnect. ...

Not necessarily. I crimped all the pins in 3 printers (Mendel over 2 years ago, Prusa2 a year ago and Ordbot Hadron a couple of months) with pliers and not a single one has come loose. I've been making connectors in this way for many years. Using a crimper does samve time so if you do it often, it's worth getting one.]]> brnrd General Sun, 24 Mar 2013 00:26:47 -0400 https://reprap.org/forum/read.php?1,194329,194382#msg-194382 Re: Hot end concerns https://reprap.org/forum/read.php?1,194329,194382#msg-194382
I left the leads their full length on the resistor, and the joints are insulated separately from the body of the hotend.]]> crispy1 General Sat, 23 Mar 2013 21:58:15 -0400 https://reprap.org/forum/read.php?1,194329,194380#msg-194380 Re: Hot end concerns https://reprap.org/forum/read.php?1,194329,194380#msg-194380 http://www.pololu.com/catalog/product/1929 They work great.

As long as the solder is outside the hot end bundle, and the hot end stays below 300C or so, soldering your wires to the resistors should be ok.

As far as the flat ribbon cable, I'd recommend teflon coated 22 gauge wire from McMaster-Carr, product# 7304K112]]> Anonymous User General Sat, 23 Mar 2013 21:45:07 -0400 https://reprap.org/forum/read.php?1,194329,194378#msg-194378 Re: Hot end concerns https://reprap.org/forum/read.php?1,194329,194378#msg-194378 brnrd General Sat, 23 Mar 2013 20:50:12 -0400 https://reprap.org/forum/read.php?1,194329,194359#msg-194359 Re: Hot end concerns https://reprap.org/forum/read.php?1,194329,194359#msg-194359 You should be able to get a decent crimp with a pair of pliers.]]> Polygonhell General Sat, 23 Mar 2013 18:51:39 -0400 https://reprap.org/forum/read.php?1,194329,194329#msg-194329 Hot end concerns https://reprap.org/forum/read.php?1,194329,194329#msg-194329
I am trying to finish to mount my RepRapPro. I am at the extruder hot end.
I have some questions for people with more experience than me:

1) From the installation instructions, I am concerned that the extruder cable that brings power to the hot end resistor, after a few centimeters of cable and connector, become a PC ribbon flat !
Picture: Hotend connected to ribbon flat

- Has really a ribbon flat the capability to support all the power for the hot resistor or it will become hot ?


2) Both terminals of the hot end resistor and thermistore should be crimped with JST stating the instructions.
I am not able to ensure a good crimp, since I do not have the correct micro crimp tool for 1.2 mm JST female.
Picture: Thermistore Crimped and Resistor not yet

Of course I can order one and wait a couple of weeks.

- Is it the same, if I fix the cable with solder without crimp, or the hot end high temperature will melt the solder ?

This is my first attempt to mount a RepRap printer, and there is no day that I can find a small problem (e.g. no correct screw, screws head to file, shrink with hot air and no gun....), and I solve them patiently. I love it, because it gives more satisfaction once the printer is ended.

In this case I do not have idea what could be the correct approach. Any suggetions ?

Best Regards]]> antimix General Sat, 23 Mar 2013 16:23:35 -0400