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Are Assembly kits a ripoff?

I guess it was inevitable. Almost from the beginning, I have been providing kits to complete the breakout boards I offer. They are fairly popular, about 90% of my customers buy them. Even though they are a pain to make, I want people to have a very high probability of getting the board running in their machine. But just recently, I was accused of "ripping people off" with the kits. I tried to understand why this individual thought that but wasn't able to get a clear answer other than the parts are cheap to get elsewhere.


Part of the dilemma of pricing assembly kits is that the individual parts can, indeed, be very inexpensive, especially when purchased in bulk. However, shipping them to me can be expensive and the time to assemble a kit is not trivial. The evaluation of quality of the parts adds cost and time - several batches of parts were rejected due to poor quality or just plain wrong parts delivered. I once had a batch of connectors that had a number of incorrect ones mixed in. That was not fun to straighten out. Maintaining stocks of various parts can be time consuming. There is also a small premium for ensuring that all the parts are known to work correctly with the board. In some cases it is about precise fit (the 2x3 header in the Ethernet kit for the T41U5XBB is a prime example). With all that, I try to keep kits cheaper than the total cost of ordering from 3 or more places, including shipping. When a kit is ordered with the board, there is zero incremental shipping cost. I do recognize that some people want to order their own parts and I am happy for them to do so. The Bill Of Materials for each assembly kit is available in the User Manuals so anyone can go and order the parts themselves. However, I believe that a significant percentage of board only sales never wind up going into a working CNC machine. I truly want every board I sell to be used in a CNC machine.


So, with all that, I think I will keep pricing the assembly kits the same way. But, I would love to hear from people either way. What do you think about this?


About Me.

I'm Phil Barrett, a long time CNC enthusiast. I run a small company, Brookwood Design, that makes several breakout boards for grblHAL and love to help people get the most out of their CNC machines.



4 Kommentare


Frank Vine
Frank Vine
09. Jan.

Having been in the same situation of supplying small quantity boards to diy builders is that many have no clue as to the real cost of "one-off" boards. The heavily subsidised and large quantity manufacturing from China has distorted the perception of value.

For a one-off project I made a while back, it was cheaper for me to buy a bunch of boards from China and remove the key component from each board to use on my own than buy the chips from a regular supplier, even in 10+ quantities. Very occasionally though, I would get feedback along the lines of "how do you do it for the price?" but that was a rare occurrence.

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brian.slee
07. Nov. 2023

Anyone who thinks that you are over charging should go price a commercial CNC controller. The board and the kit and the free GRBL/HAL software are a true bargain given the capabilities they provide to users.

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steve.potter
05. Nov. 2023

Thank you for my kit and your long instructions PDF. The work you put into it made it easy to assemble and set up, and it has been working to drive my souped-up MPCNC ever since. Well worth the price you charge for it!

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Phil Barrett
Phil Barrett
05. Nov. 2023
Antwort an

Thanks for the kind words!

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