A month ago my 3d printer was giving me fits. The quality was shit. I deduced the situation was a loose hotend heating element. There are four tiny screws buried in the print head. Three were loose and one was missing!

I tightened the three screws (which is all I had). Quality improved dramatically; though it wasn’t ideal. I went from “Soviet 1976” to “Temu”.
I ordered the part. It came quickly but I was distracted replacing a tire on my motorcycle. Once the bike was fixed, I returned to the printer. I took a lot of photos because there’s a lot of details. I didn’t want to finish the job with leftover parts!
Join me in a voyage of discovery…
Here’s the printhead with the cover removed and the hotend (the nozzle) removed. On a Bambulab A1 (or pretty much any 3d printer) swapping the nozzle is routine. Getting this far is no big deal. Note: messing with your 3d printer is OK; even a rite of passage. These things are delicate but also modular. Learning to service the modern ones isn’t too difficult.

The hotend (nozzle) sticks to the heating element with a powerful magnet and a small clamp. The heating element goes behind it and is far more technical to access and swap. It was the heating element I was replacing.
I paid $20 for a genuine part from Bambulab. Here’s a link to a similar thing in Amazon but YMMV. It’s a $14 version by a company I’ve never heard of. If you want to buy from QIMATOP feel free. It’s probably identical. For all I know it’s made in the same factory? I paid an extra $6 to know I had the real McCoy.
Returning to the story… the back of the print head looks smooth. You need to pry off a back cover with your fingernail; which I always hate. It did come off after some fiddling.
It looks exactly like something I shouldn’t be messing with.

I fearlessly pulled the heater element wires.

There’s an annoying little “wire track” that slides off.

The track holds wires to a fan and the heating wires. The heating wires are tiny. I pulled the cooling fan plug too, just so I could remove the fan’s wires and get in there. I also loosened some screws so the front of the printhead moves toward to get a fraction of an inch more access to the wires.
I was getting nervous by now. Some sources said you need to remove the cooling fan. Some said not to mess with it. I could only find two screws holding the fan on but one source suggested there was a third but if you break it, it’s no big deal. Egad! I loosened the fan but left it in place.
By now, I was committed.

After a few more screws, I’d removed the old heating element. It’s black. (This element still works and it’s already in my “spare parts” storage. All that’s wrong is a single missing 1.5mm screw.)
The replacement is white. I don’t know why. In 2026 I assume someone is shrieking that it’s racist.
Assuming the larg-ish thing is some sort of heat sink-ish thing I hope they’re identical. The replacement has a little adapter thing. I have no idea why. I installed it where it seemed to go.
The important thing is that I had 4 screws instead of 3. Those are 1.5mm screws. Way too small for the meaty hands on the end of my clumsy arms.

Here’s what it looks like before you mount the new heat element and start routing those ridiculously delicate little wires. Note the cooling fan (the big grey thing) that’s loose but not disconnected. (There’s a little dust in there. To be expected where two fans have been operating. I didn’t have compressed air or anything. I cleaned it a little, but didn’t go overboard lest I break something.)

Route those wires just so. I spent a good 20 minutes fussing over the wires in the routing channel. It’s a tight fit in there. I needed tweezers. Don’t rush.

The horizontal base to the print head is the slide on / slide off cover that hides about half of the wiring track. When I finally got it clicked in place I was pretty happy. I didn’t realize until I looked at this photo, but it helpfully points out “cable channel”. It’s tiny inaccessible letters and I never saw them.

I plugged in the heating element and reinstalled the fan’s plug. I was relieved to put the cover back over that little board of delicate things.

I’m almost home! Time to install the hotend (nozzle). That’s the thing with the cooling fins. Over the nozzle goes a “silicon sock”. You need to do this whenever you swap nozzles. The sock is a cheap part but it’s easy to tear (consider it a consumable and buy a three pack to keep a few on hand). I remembered at the last minute to tighten up the cooling fan mounts.

The last step is to put on the cover. A while ago I broke my printhead cover. I 3d printed a replacement. (I didn’t design it, I just downloaded a design from Makerworld.) There’s a zillion choices. I chose a black and white pattern but print head covers can be anything from kittens to skulls to flowers to steampunk.
Bambulab sells a replacement and it’s not excessively priced but that’s missing the point. The goal is to be a big bad 3d nerd so you don’t have to buy stuff. Making a replacement that’s just as good and also cooler is good for you. I think Bambulab encourages flashy print head covers as a “good first experience”.
I tested with a no-frills default Benchy in basic PLA. (This is the internet so I’m sure some dude is dying to tell me why my Benchy sucks. Please don’t. It’s good enough to make me happy.)

Then I reprinted a thing that had given me fits a month ago. A multi-colored, two-sided cell phone case in the image of a Pokedex (whatever that is) with print in place hinges. It came out gorgeous on the first try.

I want to give credit to the guy who made this model. It’s made by a guy called Billy 3d and you can tell he loves his art. (His name is covered and invisible when you insert the phone.)
I downloaded it from Makerworld. I’m in awe of people who can do stuff like this.
In a world that’s increasingly enshittified this guy is holding the line; in fact he’s making the world better! You can download the model from his link. I encourage you to do so. It was a great model. It worked “automagically” (once I got my 3d printer tuned and loaded with filament of the proper color).
I think he gets some sort of small income from Makerworld and/or there’s some sort of economy around “boosts” and whatnot. If I were in charge of the universe, he’d live in a solid gold house!
I don’t have a license to sell this case. I made one for a friend and gave it to him. That’s all I can do. It’s how the creative commons license works. I’m happy to be living in a world where a dude that skilled lets me sample his designs!
Also, I want y’all to step back and look at what you’re seeing.
This is flat out science fiction technology.
I had a friend that wanted a case for his new phone. Together we looked at a zillion options on Makerworld. We picked one among many. I downloaded it (legally!). It was free and complete and well designed. The case is super cool. It’s stylin’!
The cost in filament was something like $1.77.
You heard me right!
I’m in awe at what just happened:
I created a consumer object that is super cool and precisely designed for my specifications. It was printed in my house, on my equipment, but without me having any particular design skills. It was cheaper than a cup of coffee.
Are you tromping around sad because everything sucks? Are you pissed that Orange Man Bad or the price of Diesel or because AI is going to eat your housecat? Are you blackpilling over whatever the news is feeding you? Stop it! Look at how close we are to having a functioning replicator in a normal middle class guy’s house.
It’s a big thing that’s happening.
Yes, it’s not perfect. Life never is. You need a $500 printer. You need to know how to operate the damn thing. You need to figure out stuff like heating elements. You need to buy spools of filament. This particular object is just replacing something you’d otherwise buy from Walmart or Amazon
But… $1.77!
$1.77 …in the colors I want, to fit the phone I specified… delivered… to my desk.
Some things are so awesome it’s easy to miss just how cool they really are!
I also want to point out importance of a properly tuned printer. Last month my printer was messed up. (I was also using the wrong color filament because I knew the printer was off and I didn’t “want” to waste my supply.) These photos are copied from last month:



Conclusion? If your printer was great and then starts making shit… there’s something wrong. Fix it and it’ll stop making shit. (That said, the trashy first version of the case functioned adequately, it just looked like ass.)












