This is a complete fishing set in a compact box, allowing you to assemble a functional fishing rod anywhere.

To complete the setup, you will need:

• A fishing hook (approximately 10mm in size)

• A weight (0.6g - 0.8g)

• Fishing line 5-10m (any size)

• 6x zip ties (2.5mm x 100mm)

• A tree branch (between 0.5m - 1.5m in length and 10mm - 25mm in diameter)

Printing Recommendations:

This set must be printed in PETG. You can use PETG-CF or other strong materials, but the main components need to be durable.

PLA can be used for float, main box and small hook box. If you have PLA Aero - it is recommended for the float. But all parts in reel, rings and key must be from stronger material than PLA.

I have tested PETG, and I believe it is the best choice. All parts should be printed at a 0.16mm layer height due to the threaded components. 

There are ~0.1 - 0.15mm spaces between threads, if your filament flow is calibrated, than everything should screw together nicely. 1st time it can be harder to screw in everything, but it should be ok after few rotations.

You can also print zip ties, they will not be as strong as real ones, but they work if you don't have other choice. I tested all printable zip ties from MakerWorld, and i think those are the best (smallest ones from that model): https://makerworld.com/en/models/912513#profileId-873684

Assembly is easy, but here are few recommendations and walkthrough.

This set consists of:

1 - fishing reel, the main thing in this set.

2 - float / bobber

3 - rings for fishing line

4 - box for hooks and weights

5 - key / screwdriver for handle and reel

How to put reel together:

A - Take both sides of reel spool (4 and 5) and screw them together.

B - To make it easier to wind up fishing line, you can place end of fishing line on the thread (8) and screw it in the spool, and test it for strength, if it doesn't come out, than wind up some 5-10m of the line on the spool.
C - Take central screw (7), put it through the spool (4,5) and screw it into main body (6). Use screwdriver (1). 

Before assembly screw it IN and OUT few times to make thread work better.

Adjust strength of central screw so that spool doesn't rotate freely, but with small force.

D - Take handle (3) and use screw (2) to attach it to the spool. Use screwdriver (1). And also screw it IN and OUT without handle few times to make thread work better. Adjust screw so that handle spins freely.

Make the bobber/float

A - take top of the float (2), put on the ring (3) and screw on bottom part (4)

B - insert pin (1) into float

Putting all together:

A - now you need rod, you can cut it down from some bush, or take some bamboo stick, or make some nice rod from pine plank in your workshop.

B - use 2 zipties to attach fishing reel to the rod, placement is as you wish, ussually about 10-20cm from the end of rod.

C - use 4 zipties to attach all 4 line rings to the rod, smallest one at the end, biggest one some 20-30cm from reel, and aligned remaining two in the middle. (if possible use pliers to fix those zipties strongly)

D -  As you already winded fishing line on the spool (1) in the beginning, take end of the line and pull it through all rings (3), put it through the float from the top (4) and fix it with the pin, attach weight (5) and hook at the end (6). You can use your own knot, just check that everything holds together.

Weight should be 5-10cm from the hook.

You can adjust floats distance from hook by taking out the pin and pulling line, and putting pin back in.

Now you can go fishing, here are few main things:

1. Check that hook is securely attached.

2. The float should be placed on the line at a distance that keeps the bait near the bottom or at the depth where you see fishes.

3. Adjust weight so that float stands up straight.

4. For bait use worms, bread or corn. You can find worms under old planks or stones in wet places.
5. Throw the hook with bait in the water, wait for float to disappear under water and then pull it out quickly but gently by turning the reel handle.

6. If you need the fish for food, than place it in a bucket of water. 

7. If you releasing the fish, gently remove the hook, kiss the fish and place it back in the water, don't throw it. If you taking the photos, do it as quickly as possible, and put fish back in water.

And here you go!

Fishing is about patience and enjoying nature. 
Relax, watch the float, and enjoy the experience.