The goal for this model was to find a solution for soldering small PCBs. I always had difficulties with holding the soldering iron stable and this is relatively important with small PCBs. That's why I wanted to design a soldering help to keep the soldering iron always stable and still be able to move it in all 3 axes. It was important to me that it feeds the solder directly and you don't have to use an extra hand just for that. I also wanted to be able to change the angle of the soldering iron at any time and not be limited to just one angle, as different jobs require different angles.

If your soldering iron has a diameter of 2 cm or more at the thickest point, use the correct version for the soldering iron holder, look in the description of the file.

Printing settings:
All files are rotated correctly.
All files were printed with a layer height of 0.2mm. Almost all files can be printed without support, if support is required this is indicated in the file labeling. I have printed almost everything in PLA, except for a few files that are close to the soldering iron, which I have printed in ABS, I have also indicated this. Two small wheels are also made of TPU.

Materials:
For the model you only need a few screws, a few rubbers and a small scrap wood plate or similar to attach, otherwise everything is 3d printed. It is an advantage if you have a PTFE tube (4mm), these can also be found very cheaply online, I took the replacement from my 3d printer, but you can also get them very cheaply online. If you don't have one, you can also feed the solder manually.

In case of assembly problems:
I have printed all parts that need to be fixed with a clearance of 0.075mm, all others with a clearance of 0.1-0.15mm. If your printer has problems with this clearance, you can increase the clearance in your slicer, if you don't know how there are many tutorials online.

Problems with the guidance of the solder:
If the solder passes next to the soldering iron, simply heat the part with the tube for the PTFE hose with a hot air gun and bend it into shape.

Problem with the Z-axis
If it is too strict, print the z-axis top and place it on the z-rail.

Assembly:

It may be that some objects look different, this is because I optimized some files but did not print them again.
The model consists of 3 main parts, if you don't have PTFE tubing, you can print the more convenient lever which has no solder supply.

PCB table
Additional materials: 1 small rubber band
The following 3d printed parts are required for this part:

1. place these 3 gears in the X-rail.

2. fix the gear wheel with the rod.

3. insert the large cogwheel and secure it with the rod.

4. place the small cogwheel in the matching hole at the bottom left. The best way to do this is to turn the rail and push the part in with a needle.

5. insert the double gearwheel into the next hole and fix it with the rod.

6. now insert the gear wheel and push the rod from step 2 all the way in.

7. insert the gear wheel and fix it in place with the large wheel.

8. insert the small gearwheel and fix it in place with the other wheel.

9. fix the 90° gear wheel in place.

You should now have 1 gear wheel left, which you will need later.

10. place the long cogwheel and the 2 green studs in the X carriage.

11. place the Y-rail on top.

12. fix the rail from both sides with the other two studs.

13. now push the two rails for the PCB holder into the Y carriage.

14. place a small rubber on one of the PCB holders.

15. fix both PCB holders on the Y carriage, place the rubber over the non-movable holder and fix the non-movable holder with the stud.

16. join the two parts together.

17. push the X-carriage in and fix the gear wheel. (If it doesn't go in, you have to turn the wheel for the X-axis).

Soldering iron holder
Additional materials: 2 rubber bands (or springs), 1PTFE tube
The following 3d printed parts are required for this part:

1. screw either an M5 screw or an M4 screw with a threaded insert into the prefabricated hole.

2. clip the soldering iron holder into the Z-carriage.

3. guide the Z carriage onto the Z rail.

4. fix the soldering iron with the clamp and insert the PTFE hose through the tube.

5. now fix the part with two rubbers or springs.

Lever and solder feed.
The two black wheels in the picture are printed from TPU.
If you do not have a PTFE tube, you only need 4 parts and can skip steps 1-7.
The following 3d printed parts are required for this part:

1. take the two gears and place a plate on them.

2. add the two TPU wheels.

3. place the other plate and the gear on top.

4. place the entire part in the housing.

5. add the small gear wheel.

6. place the wheel.

7. close the housing.

8. place the lever in the holder and fix it with the rod. (Pay attention to the direction)

9. you can then close it from the other side.

Placing
Additional materials: a string

1. place everything on a wooden board in the way that works best for you. I have not attached the PCB holder as I prefer it to be flexible, but it also has holes to attach it. The long rod in the picture is the holder for the solder, and the two small string guides are the diverters for the cord, you need to attach these so that there is a good guide from the soldering iron holder to the lever.

2. you can insert the other end of the PTFE hose into the lever.

3. you can attach one end of the cord to the Z-carriage (to the prefabricated nub) and lead it to the lever. (Make sure that the cord runs smoothly and reposition the small string guide if necessary).

4. thread the cord through the lever. On the other side, thread it back through the Z-rail and attach it to the Z-carriage.

5. with an additional small string guide you can now tension the cord so that the ratio of the lever to the height of the soldering iron fits.

Now you're done, have fun with the soldering help!