I need to mess with the PID loop on the 3D printer. Right now it’s got about 12 possible temperature states in a look-up table, and that’s not enough. It needs 60, I think. The symptom is that the print never starts, and I believe that’s because the temperature never stabilises enough. If the change in loop doesn’t fix it, I’ll end up using an Arduino/Ramps combo, but I need to do this.
I’ve needed to do it for about five months now. I do not want to flash that damned thing Yet Again. For one thing, it’s been months since I have and I’ve forgotten most of the steps.
Update: Have accidentally ordered an Arduino Mega to go with the early RAMPS board I picked up. I was on eBay and it fell into my basket.
I’ve replaced the head on the 3D printer. Mechanically, it’s all fine. Physically, it looks good. There’s a bit of wobble, but that’s a matter I can deal with trivially with shims.
Now I need to flash new firmware. Probably not using a .hex file – I should be able to expand the Arduino environment a bit. So listen out for sobbing.
I’ve printed out a holder for a new hot end, and a new extruder, and I don’t have room on my table to set up a 3D printer or do any soldering. No matter how much I tidy my room, it ends up with no visible floor. Much of this is for other people’s projects, and some of that I’m getting paid for, but it’s still a drag.
Nevertheless, I put together a 3d printer extruder. Three times. Damnit.
I’ve borrowed a roll of kapton tape (maybe kaptan, I don’t know, I just know that kaftan keeps on trying to get in the way) and I’m using that to keep the thermistor electrically isolated from the heating block. Now I’ll start ‘er up again…
The kapton stayed on, which is great. I need to bind the thermistor in better, which I’ll do when it’s all cooled down again, but nothing broke.
There’s a school of thought that says the hot end of a 3D printer shouldn’t be a solid block of plastic. After examination of both sides of the evidence, I have decided to subscribe to this.
I bought a cheap 3D printer. Once I had bought it, I found out it was from clearance but had probably already been in some way paid for, which is annoying. Someone else didn’t get their machine, and while I know there is no direct connection between me having this and another, particular person not having it, I am still profitting in the cheapness of a clearance machine from the money that someone else put in.
That aside, and it’s not a moral problem for me given the circumstances, I’ve now got a cheap 3D printer. The hot end, where the plastic gets melted, is famously terrible on this machine. It was a new design and tiny tolerances were needed, and it didn’t quite work. And also, I broke mine. So I’ve 3D printed a different big of plastic to hold a different head, and someone who was not using an old heater end and some other bits donated them, meaning I’m still getting a cheap 3D printer rather than an expensive time sink. It’s a cheap time sink instead. Currently bits of the hot end are cable tied together and the whole thing is about as shonky as a unicycle on a rocking chair.