Solder paste dispenser 3cc v.2

 

A new approach to an old idea

When I was making a new nozzle for lubricating the printer, it immediately made a clicking sound - it was time to update the dispenser itself. To be honest, the previous version worked well, but I had a few goals in mind: to improve ergonomics, eliminate unnecessary post-processing, and... see what my printer could really do when it was pushed to its limits.

 

This is the birth of the v.2 solder paste dispenser - a simple and accurate tool that is truly satisfying to use.

 

What has changed?

At first glance, there's almost nothing. But this is misleading. The real improvement lies in the details. I completely redesigned the design from the perspectives of ease of use and printing accuracy. For example, I managed to print fully functional M2.5 and M3 threads directly on the printer, without the need for post-processing. Who would have thought M2.5 could be printed? Of course, this requires a finer nozzle and thinner layers. Yes, printing now takes longer, but the results speak for themselves - the parts can be assembled without any filing.

 

 

Design and materials

This time, I printed the main body and plunger in PLA, and the feed wheel in ABS. Visually, the use of complementary colors created a contrast that I personally really like. Of course, you can choose your own color scheme. Even with a standard 0.4 mm nozzle, the entire design can still be printed - the only exception might be the threads, which may require some cleaning with a water hose.

 

What's the deal with the ring?

Good question. Many people ask why there's an O-ring on the auxiliary plunger - an O-ring with small holes and no sealing function. The answer is simple: it prevents the shaft from rotating. When you turn the feed wheel, the threaded rod pushes or pulls the plunger forward or backward, and the O-ring prevents it from rotating. It's a small detail, but it adds a lot of stability.

 

Why 3 milliliters?

Because it's very convenient. I fill the grease into the syringe once - this amount is just right for a complete printer maintenance cycle. The same 3ml size is also suitable for welding - flux, solder paste, etc. It has a small volume, accurate delivery, and no drying or hardening. Minimalism at its best.

 

By the way, in the description, you will find links to my other designs - for lubricating lead screws and shaftsRuhr lock nozzleIt includes a syringe for transferring grease to a syringe adapter and other useful accessories. Yes, even a cap - it's also new.

 

Video and assembly

This project is simple because it's straightforward. A few parts, a few screws - and you're done. Watch the full assembly video demonstration. Meanwhile, print it, build it, and experiment with it.The solder paste dispenser v.2 is ready to use.

 

For more details, please refer to the video:

If you like this item, let me know by clicking the 'Like' button!

 

The link to the parts is as follows:

• ESUN PLA filament
• eSUN eABS + HS
• Industrial syringe, 3CC
• Axial thrust ball bearing F3-8M
• Brass M3 threaded rod
• M3 threaded rod
• M2.5 button head screw
• Hot-swappable nut with an iron head
• Insert a knurled nut M3
• Black O-ring gasket CS, 2 mm OD, 9 mm
• Steel dispensing needle
• Ruil lock adapter coupler
• 3x3 mm round magnet

Link to the tools used:

• NOGA deburring tools and blades
• An angle grinder
• Reamer tool set
• Hard alloy machine-used hobbing cutter
• SmallA knife with a serrated blade
• Thread taps
• Tap drill bit

My new machine:

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