Reflow Master Pro is the evolution of the original Reflow Master - with awesome new features, and improved usability.

Please Note: RMP Supply is currently limited due to the silicon shortage.
We'll keep adding more stock in small batches as components come in. Thanks for your understanding!

Reflow Master Pro has killer features and an easy-to-use interface with beautiful reflow graphs. It comes with five built-in solder paste profiles, and a built-in webserver for adding, editing, and removing profiles, with a graphical view of how the profile will look.

Reflow Master Pro is designed to work with any toaster oven - no algorithm tuning required! That said, if you really want to tweak, you can switch from the classic Reflow Master algorithm to PID control and tune your settings to exactly how you like.

Web Interface

Reflow & Bake Profile Management

Reflow Master Pro is WiFi enabled, and once WiFi is setup, you will have access to a browser interface to add, edit and remove reflow paste profiles and bake profiles as well as alteer all of the settings via the built in web server!


We’ll be adding more functionality to the web interface in future updates!


  • Dual Thermocouples
  • Dual Auxiliary outputs for controlling fans or other devices
  • Reflow Mode
  • Bake Mode
  • Profile management via built in webserver
  • Extensive settings and control
  • Easy firmware updates
  • E-Kill switch support

RMP has a beautiful and easy to follow graphical display during the reflow process.

The purple graph is the paste profile selected, and the green graph is the realtime update of the temperature matching.

You get to see the SSR power being applied as well as current temperature and target temperature at the top.

The main reflow zones are also clearly labelled for you.

Bake Mode

RMP features an awesome bake mode that allows you to do timed baking of things like filament, electronics components and more.

You can add your own bake profiles for your specific needs via the web interface.

Extensive Settings

RMP ships with an extensive list of settings and options, and we'll be adding more features and flexibility in future updates!

You are able to control 2 external fans, individually, during reflow/bake and after reflow/bake. This allows you to run them at a slow speed to help circulate air during reflow, and then full power for a period of time after reflow, as part of the cooling process.

Reflow Master Comparison Matrix
Reflow Master Pro
Reflow Master
AUX Outputs
Settings/Data Storage
uSD Card (FAT32)
Web Interface
Reflow Profile Management
Via web interface
Via code and reflashing
Bake Profile Management
Via web interface
USB-C (5V)/DC Jack (5V)
USB Micro-B (5V)
Emergency Kill
Support for external Kill Button


What do I get with my Reflow Master Pro?

  • A fully assembled and tested Reflow Master Pro
  • 2.4" Colour TFT screen
  • 2x K-Type thermocouples
  • Optional items include:
  • 3D printed case (pictured above)
  • RM Fan Controller modules for connecting up to 24V fans or other auxiliary devices to the auxiliary ports on the RMP
  • Micro SD card for settings storage (Formatted as FAT32)

What else do I need to use the Reflow Master Pro?

  • Solid State Relay (SSR) ( 5V+ DC <-> 100/240V AC )
  • Micro SD card for settings storage, formatted as FAT32 (if not ordering one with your RMP)
  • USB-C cable or 5V DC power source via barrel jack

Can I print my own case?

You bet! Just download the STL ZIP file and slice and print them in any colour or material you like!

The ZIP also includes an image to show you how to orient the 2 pieces on the print bed for best printing without supports.

If you'd like to make changes to the case, we've also got a STEP file of the case available as well.

PLEASE NOTE! The latest RMP 2022-12-12 versions that I am shipping have a slimmer build, and do not fit inside the original RMP case, so I have provided a new SLIM STEP version of the case for those of you that would like to print your own. You can see the version of your RMP on the back of the board. The previous RMP version (2022-3) wont fit in the SLIM case, and requires the original version.

Why don't I provide the Solid State Relay?

That's a valid question... Every toaster oven is different and mains power is obviously not universal and is dangerous to play with. I don't feel comfortable supplying a generic "Chinese unbranded SSR" that might be unreliable or inadequate for your specific use case. I could supply something I am prepared to endorse & support, but it would be considerably cheaper for you to source one yourself - rather than me buy one and reship it to you.

This is the SSR that I use ( 15A Model )

Are the provided Thermocouples good enough?

Yes, the K-Type thermocouples I supply are good enough for most environments and use cases, but if you are using your Reflow Master Pro in an area that suffers from high frequency noise from power or mobile antennas etc, you may get some extra noise in your temperature readings.

If that is the case, you might want to invest in a better thermocouple, something that is really well shielded in metal or fibreglass, like one of these from Adafruit

Also, if you plan on reflowing high temperature pastes 190deg+, I'd definitely recommend a glass shielded thermocouple to ensure the probe shield can withstand the 200deg+ temperatures required for reflow.

What toaster oven do I need?

From my own experience and from working with other makers that use both toaster ovens and my Reflow Master, there are 2 key requirements for a toaster oven to be usable as a reflow oven: It needs to be small and powerful - so ideally you want an oven that is 18 Litres or lower in capacity, with 1300W or higher in power.

If your oven is too big or under powered, or both, then your oven will not be able to get to the initial profile temperature in time to allow for an adequate pre-soak time. You MIGHT still get a successful reflow, but it will likely be out of the guidelines from your solder paste manufacturer - so you'll need to check your specifications for your paste to assess the repercussions.

The smaller the oven, the faster it will heat, just like the higher the power, the faster it will heat. Having a smaller and more powerful oven is the safest bet.

What about hot plates?

Sure, you can control a hotplate as well if you prefer to reflow your boards that way. Your hotplate will likely be grounded, especially it's a commercial unit, or one that is powered via AC, so you wont be able to connect a thermocouple directly to it, or it will cause an error when trying to read the temperature. To solve this, you can use some thermal tape to stick the TC to the plate, that will allow heat transfer for the temperature reading, without any electrical connectivity.

Can I control the reflow process remotely?

Nope! I know it sounds like a great idea, but it's also a really a dangerous one, and it would be totally irresponsible of us to allow you to fire off a 280C or higher reflow process, both unattended and without visual monitoring. You don't leave a laser cutter unattended, and you should never leave your reflow oven unattended, especially one that is DIY'd from a toaster oven, where you are controlling mains power.

What are RM Fan Controllers?

RM Fan Controllers are basically opt-o-isolated MOSFET switches that you can connect to the AUX outputs of your RMP to drive up to 24V/1A loads like fans or in the future, stuff like linear actuators.

RM Fan Controllers ship with the surface mount parts full assembled, and the through-hole parts separate, so some soldering is required to use them, but I know you all love to solder, so it's a perfect mix!

Can I just use some cheap $2 MOSFET switches from Ali? Sure, if you want to take the risk, but I can't, in good conscience, ship something like those with my products and be able to trust and support them if they fail. So I designed and make my own, that have had extensive testing, that are built with reliable components and that I trust and can support.

RM Fan Controller
Can I reflow SAC305 with an RMP?

Sure! RMP can reflow any paste - But, what you are really asking here is, can the RMP make an oven that is not powerful enough, or insulated well enough, reflow high temp paste? No :( Physics is physics, and if your oven of choice is not able to reach the temperature required, fast enough, to manage a reflow profile for a high temperature paste like SAC305, then adding an RMP wont help.

Most toaster oven, as they come, are not capable of ramping temperature fast enough, or of holding the temperature at the higher end of the process, especially when you start to add extra thermal mass into the equation.... like PCBs wth components on them.

That said, there are many folks that have gone to extraordinary lengths to completely insulate their toaster ovens and make them capable of reflowing the most difficult pastes. Do a Google search and you'll find a few projects showing step by step how they did it, but be warned - it's a lot of effort, and costs quite a lot to make happen.

The #reflow-master-pro channel in my Discord server also has pictures and discussions from folks that have modded their toaster ovens to get high tep paste reflowing.


Hardware Installation

Wiring up your RMP is very easy. Simply connect the thermocouples to the correct coloured inputs (Red/White), connect your SSR's digital input to the +ve and -ve inputs and you're done!

If you also have some RM Fan Controllers, simply wire the +ve and -ve signal inputs from them into the corresponding +ve and -ve inputs on your RMP.

Please look into your local requirements for dealing with mains powered appliances before undertaking any DIY work.

RMP Wiring

WiFi Setup

You can connect your reflow Master Pro to your home/office WiFi network, so you can use the web interface to manage reflow & bake profiles, and adjust settings. To setup your WiFi SSID & PASSWORD setting so your RMP can connect to your network, follow these steps:

  • Press "Setup WiFi" on the main menu of your RMP
  • On your phone, go to your WiFi connections page and join the RMPro WiFi hotspot - if it doesn't automatically appear, refresh your list
  • Once connected, a web portal page should automatically appear on you phone, showing you a list of nearby WiFi access points. Select yours.
  • Enter the password for your network (SSID) and then click save.
  • The RMP will try to connect to that SSID & PASSWORD combo, and if successful, you will here your RMP beep, and the portal should shut down and put you back on your normal WiFi network
  • If the connection fails, it will let you know, and ask you to try again.

Once your WiFi credentials are saved, your RMP can be connected to your network using the same button on the main menu. Once connected, the button will change to show you the IP address of your RMP. You can now navigate to that IP address from any web browser on any device you like, to access the RMP web interface.

Firmware Updates

RMP Firmware

We've made updating your RMP to the latest firmware as simple as possible!

There's no need for any IDE or development environment, no need for tracking source changes or compiling any code. Updating your RMP is as simple as plugging it into your computer, putting it into "Update Firmware Mode" from the settings screen, and following the web-flashing tool instructions.

Note: The web flashing tool requires Chrome or Edge, sorry Safari users!

Firmware development for RMP is ongoing. We have a lot of features planned, and we'll be working closely with early adopters on any issues that may arise, and gets fixes out quickly.

Buy a Reflow Master Pro

Reflow Master Pro is shipped directly from Unexpected Maker in Australia, but I offer multiple ways to purchase, including now offering it via Lectronz for EU customers, so VAT is handled for you at check out!