I propose and I would wish the option to get 35 microns (1 oz) of copper on the inner layers. A modest extra fee will be OK.

Option to speak or chat with customer service

Your fist page should show EXACTLY what we need to make things go. So far, I still don't know how this works. The manual for my Grove device says I ned a Seeeduino board with driver board, but you don't sell those?

Idea: SEEED should list Mainland China based "BOM - Alternative Purchase Links" Vendors like ARROW, Digi-Key, etc so PCB clients can find alternative purchase links when a BOM is not accepted because some components not being available in the SEEED inventory.
This is assuming that the SEEED PCB manufacturers are located in major Chinese cities where the alternate vendors may have component stocks.

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Change the Gerber files

There are many users who have problems and uncertainties with loading gerber files.
Viewer could give some feedback to user. For example - did it load the files correctly or something similar, because when it doesn't show some primitives, user doesn't know is it because of bad files or gerber viewer is made that way.
As example - I am not sure about board cutout - will the PCB be cut or not. Also I am not sure about the holes.

It would be nice to have FPC Cables and FPC Cable Sockets in OPL. :)

Respond to emails and support contact messages in a timely fashion.

Send an email with the DHL tracking number when it actually ships

NodeRED flows for Grove IO modules and the RaspberryPi!

Logic level shifter for grove components:
I'd like to suggest a logic level shifter for I2C, digital, and analog Grove components. I'm envisioning a small Grove PCB with two grove connectors one 5V power supply connector and a logic level shifter fast enough for I2C (e.g., https://www.adafruit.com/product/757). The grove logic level shifter would allow to easily connect 3V microcontrollers to 5V grove components.

No register is possible. System Registration is working bad.

Custom shape FR-4 boards for prototyping without copper.
I would like to order a PCB without any copper in FR-4 material to be used for functional support parts for a prototype we are working on. It is a strong material (better than laser cut acrylics or wood) and you probably already have the machines / partners to deliver. Should be easy to add function for you guys.

How about supporting CADSTAR files?

Cheap international shipping